I tried to set the minimum air for the IAC. I grounded the A and B terminals, turned on the ignition and let it sit for 45 seconds, and disconnected the IAC. I then set the minimum air to 500 rpms in drive, and after reconnecting the IAC, the car idled at around 700, which seemed fine to me, except there was now a SES light. I shut off the car, went inside, came out about an hour later and started the car. For some reason it now idled at 2000 rpm in park. Since I had to go, I just turned down the minimum air adjustment screw to bring the idle down to around 1200 in park so I could drive.

The whole time I'm driving now the SES light comes on and off, and occasionally I get a sudden power loss and the engine seems to stutter for a second or two.

What should I do now? I tried to set the IAC to make my idle better and now it's a whole lot worse - what did I do wrong?

Thanks for any help

Chris

 

Did you reset the computer after the adjustment?

 

After moving the throttle plates to the proper minimum air position, did you readjust the TPS to the correct voltage?