I have a 1985 Toyota 22RE auto transmission 4x4 with a remanufactured motor in it with about 600 miles on it. It starts and runs great while in neutral and once I shift into drive it runs and idles smooth while cold. Once it is warm after I have been driving it at least 10 minutes the idle will slow a bit and run rough at stop signs but if I shift into neutral or park it returns the idle up a bit and runs smooth. Once I start accelerating it runs great with no issues, just runs rough while stopped. It also seems to start rough after it has been running for a while and I stop into a store for a few minutes and come back and start it. I did notice on the biggest hose from the middle of my valve cover to the intake has small crack where it fits onto the fitting so I temporarily zipped tied that tighter and I doubt that is it. I will try to replace that hose this weekend. My old motor ran similar to this but would only run rough after I start it from being in the store for a few minutes and thought the old clogged fuel filter was the issue.

I know there are a lot of posts but have not seen any with the auto trans. It is weird it runs very smooth if in neutral or park but soon as I put in gear when warm it runs rough and idle drops a bit.

Any ideas?

 

check all vacuum lines, tranny fluid, timing, tps setting, and anything that has to do with idle compensation for the load applied. thats about the best i can think of for ya.

 

 

I adjusted the timing back to about 6-7 and then opened up the idle screw about 1.5 turns. Runs great now warm while stopped and starts great without rough idle after being turned off for a few minutes. I don't have a tach but it doesn't seem to be to high of idle while in park or neutral. Turned out to be an easy fix, thanks for your help!

 

Glad you got it good.