My 97 SE started doing this on a road trip from Iowa to Vegas. After most of Nebraska had gone by in a 85mph blur
, she started surging (both small ~100rpm bumps, and larger ~500rpm ones too). Started getting annoying
on the uphill grades moving into the foothills in Colorado. Brought it to a dealer in someplace, whereeversville, and the tranny fluid was brown, so they flushed and new filtered it. Got better for awhile, then again on the way home (my girlfriend had toasted across western Nebraksa at 95+ while I was asleep
) it got pissy again.
Took it to the dealership where I'm from and they flushed it again. Then I got another ticket, went to driving school, got in trouble with my parents' insurance company-read drove slow for a year so I didn't lose my license and insurance. Anyway, with 70ish interstate speeds and no more 3500 mile trips the tranny has been fine for a year and the fluid was nice a pink, smelled yummy.
Then, about a week ago, I had to get back from Omaha real quick like, after about 30 minutes of 85-90 mph the surging came back
. Gonna get another flush and add a tranny cooler soon.
From reading many posts similar, but older, than this thread I've decided that the problem is definitely tranny related not fuel or electrical, probably in the torque converter due to lack of problem when accelerating harder. Good, clean, cool tranny fluid helps as a bandaid, but the problem is probably in the TC or TCC solenoid whatever. Less monkey advice or tranny knowledge would be welcome here, I hope this thread continues
for awhile as they have been several people with stock cars that need help with this, but not alot of advice from more experienced/knowledgable members as this doesn't seem to be a problem for already cooled and beefier trannies.