I just reinstalled an A6 into my 88 HF. Now it seems like i have fuel cut. ECU is throwing code for IAT and IAC. when i press the throttle the engine will rev then drop and rev then drop over and over quickly.

It ran perfect before I took it out. I replaced the throttle body b/c the idle control vavle was bad.

Any suggestions?

 

I believe you swapped the IAT and IAC plugs try switching them and see if that helps

 

do that.
check grounds.

 

thanks super chicken and warrick, that was the problem.

 

another satisfied h-t member