1995 Toyota Tercel - 105k miles - automatic transmission.
When the car gets to between 65 - 85 mph the car randomly jerks. It never happens at speeds over or under 65 and 85. When i say "jerk" i mean just one single jerk...not very hard, but you can feel it. The jerking isnt often. Sometimes it will happen 3 times in 10 minutes and sometimes it will go an hour without happening. Anyone have any idea what this can be?
I also have a 95' Tercel and I too have the occasional jerk/buck. Mine does not do it as often as yours, more like maybe once or twice a week whether accelerating or constant cruising. I have also noticed that it does it when cold or just after 10-15 min. of use (I usually commute in it for about 50-60 min.). Mine has definately diminished to like once every two weeks sometimes three or four since I put injector cleaner in the gas tank every oil change. I still have not figured out what the heck it is, but I will continue to add this cleaner from now on. I figure $2 every 3K miles wount hurt and it seems to be working. BTW, my Tercel is a 5-Spd and with 126K miles on the clock.
I made a post earlier with what I believe might be a similar problem. (Engine cutting out at 75) What was happening to mine was that at 75 after about 8-10 miles it would behave like it was starving for fuel. If I let off the gas, and press it again it would catch up and run for a while then cut out again. If I kept the speed at 70, no problem. What I found was a vacuum sence switch, mounted on the firewall that had a cracked vacuum line going to it, that switch will cut the engine if vacuum is lost. I have replaced that line but I haven't been able yet to check it at 75 or above for an extended distance to prove that I have really solved the problem. I have run it at 75, but not for 10 miles, no cut out.