barnaclebill
Atlanta, Michigan or towards the sun
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Joined: 03/09/2005
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My dad had a Ford E-350 that had a partial blocked exhaust that acted near what you are describing. A baffle would move inside the muffler(we guess) and block the flow at highway speeds and would lose power but ran fine at idle or slower driving. We changed many parts till I dropped the exhaust and then it ran fine.
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PaulJ2
Northwest Oregon
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Joined: 12/23/2005
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I still agree with jakcheese-- Fuel pump,Fuel pump,Fuel pump. If you haven't already.
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tdsmith
North Carolina
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Joined: 02/24/2008
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If you start to think its the fuel pump, go to Advance Auto. They have one by Holley, it is real similar to the one you have on your motorhome. It is an electric fuel pump. It is a high pressure fuel pump, and it comes with the regulator. It is real easy to change out. I changed out the fuel pump in a campground after breaking down. I did not change out the regulator because the fuel pump was my problem. The number on the box is 12-802-1. If I'm remembering right they are about $130.00. I have the same chassis and motor as you, wish I could tell you more.
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hairbrain
pennsylvania
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Joined: 01/07/2009
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Change the fuel pump, had the same thing in an 84 pace arrow, 454 engine, problem solved.
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TEO
Inverness, FL, USA
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Joined: 08/07/2003
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OK, Everyone is going to think I'm nuts, but I had a similar problem on a 1988 Southwind on the John Deere chassis with a Ford 460. I had the carburetor rebuilt, and the first time I had it out it again backfired and ruined the power accelerator valve. Replaced that and it happened again. It turned out that my problem was inthe plate between the carb and the manifold. It has a connection for some rubber hose. The problem was that the plate was cracked and allowed air into the intake. I can't say that you have the same problem, but that's what I had.
Paul
Paul & Helen
2002 Winnebago Journey DL
1999 Jeep Cherokee toad 
Yellow Lab, Jodie and Chocolate Lab, Coco 
FMCA 98905
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jahapp
Wherever the soft breeze blows
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Joined: 04/10/2004
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The in tank fuel pump may be shot.
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Dieselclacker
California
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Joined: 10/28/2005
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Check the fuel pressure while engine is under load. You have fuel starvation. Fuel filters or fuel pump.
Dieselclacker
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thunderstruckhd
Ft.lauderdale and Key West,Florida
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Joined: 04/24/2007
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dup. post
* This post was
edited 05/15/09 07:23am by thunderstruckhd *
2006 Allegro Bus, 42QDP, 4 Slides, Tag axle, Spartan, 400ISL.
Progressive Ind.PT50C
TST TPMS
Assorted toads,trailers and toys.
And Zoie the Doberman.
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thunderstruckhd
Ft.lauderdale and Key West,Florida
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I've been fired up over all the advise given here. I sugested to the OP to bring it to a shop, but if he wants to continue to waste money on parts so be it. I will offer some help because that is all I'm trying to do. It is deffenetly not the fuel pump, a bad fuel pump will result in a lack of power not the simptons the OP lists, this is a carburated motor, fuel inj. motors have the fuel pumps in the tank, not carb. motors. It only needs about 5-6 lbs of fuel pressure to run anyway not 40 to 50lbs like an injected motor.. It is also not a bad coil, Motors of this vintage have only ONE coil and a bad coil will cause a "missfire" not popping back as the OP discribe. One of the reasons I get fired up is some of the advice comes from people who have no clue judging from their sugestions and will serve only to hurt not help the situation. Start with the carb. GET RID OF THE HOLLEY, very hard if not impossible to rebuild properly. Have it rebuilt be a carb. shop who specializes in Holleys, your problem is most likley the carb, but without the RV in front of me and able to run tests is just a good guess. From the symptoms the OP states his problem may be internal, the symptoms also describes a bad camshaft or valve train problem...
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thunderstruckhd
Ft.lauderdale and Key West,Florida
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jahapp wrote:The in tank fuel pump may be shot.
"Shot" is this a technical term ??? There is no fuel pump in the tank on a carb. motor....
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