RE: park/emer brake
Glad to see Roger still helping people with the AutoPark. He helped me learn all about them for many miles of troublefree rving. Thanks!
RE: spark plugs in a 454 chevy
I agree with changing plug wires. Talked to a long time RV mechanic that suggested replacing them every 20,000 miles to avoid trouble. I also agree with using AC plugs.
Good luck!