urluzn2

Im driving my 89 200tqa and coming to a stop it justs starts idling high, up and down between 1k- 2500 rpms. I checked the rod on the cruise control, even took it off, throttle cable isnt stuck goes all the way back shut, unplugged the isv, no diff at all. Ran the car and pulled the oil cap to see if it dies, nope. Keeps on running the same, bad. I read that if it doesnt die when pulling cap, that i have a vacuum leak.??? When im driving and i go to shift, it jumps in between shifts, so if i shift at 3k it jumps like another 1k. Please help, thx

rooster 2

check all hoses for possible leak again. If the leak is bad enough, you might be able to hear the vacuum leak, so listen up for the sound of rushing air.

There is a molded rubber hose that plugs into the ISV. In the past, I have had that hose go bad. It would look okay at first glance, but found the bottom side rotted out with a hole in it. Suggest carefully inspecting all vac hoses for a leak.

rooster 2

Pulling the codes should also help you find the problem.

urluzn2

Well i cleaned isv with no difference, pressurized the throttle body with compressed air, the only leak i find is the small hole in the throttle body. Is it supposed to release air at that spot, small rubber nipple on the outside of that hole? All hoses are in excellent shape, like new. Nothing is brittle or dry rotted on this car. Ill check codes tomm, any other ideas? Sensors or what? Thx