Hi ya'll, just bought my first mh. 2000 allergo workhorse 7.4 with 43,000 mi. Belonged to a retired preacher that loved to keep ALL service records. I do most of my work myself, 4-wheelers, My tractors, kubota 1991, Gravely7.6 walk behind mower(1971) and everything else that has a motor on it. My question is when i go down the road the rpm jumps around 100 to 200 more than normal (1,500 rpm), every 2-3 miles even on level road going 50 mph with cruise/ without/ on o.d or just in drive. do i have a vacuum leak? computer problems? have plenty of power when i apply, so i dont think it's tranny slipping. any ideas? thanks in advance, and pics coming soon.....