i have posted in the past about this issue.

i have an idle problem on my 1994 xl supercab 3.0 4x4 stick shift with 168,000 miles.

when coming to stop, the idles sometimes sticks at about 1500 rpms and then come down sometimes. also when shifting and pushing in the clutch, the rpms jump slightly.

at first, i tried cleaning the iac valve and that did not do anything, so i bought a new valve the other day and installed it but the problem did not go away.

could it be the TPS or should i look for vacuum leaks?

i know the 2 big hose clamps from the motor to the airbox are tight so no leaks there.

i ave scanned truck with tool and got no codes.

any ideas or advice?

thanks.

 

Was doing a search because I have a similar problem.

Since you replaced the IAC it's just about gotta be either a throttle plate not closing all the way or a vaccum leak somewhere. Something between the MAF and the intake gasket is letting air get by.

Another thing that is possible is a bad PCM temp sensor.

Rich