My 99 F-250 7.3 has routinely sits for 2-3 months without many problems. I once had the problem that a previous poster mentioned about the batteries going down. It turns out that one of the two batteries had a bad cell and the bad battery was draining the good battery causing the truck not to start after 2 weeks of sitting. I replaced both batteries and the truck is happy again. Before I drove it yesterday, it had sat 2 Months.
You need to change your user name, it may interfere with your next best friend
99 F250 PSD CC LB 3.73 4X4 7360 lbs, and it can sink in the mud FAST, 2004 Coachmen Catalina 297RKS 8200 lbs on the road. US flags and/or POW/DV tags on foreign cars just don't seem right somehow. Your opinion will vary.