I had the 1100-1500 hunt going like mad for 10 or so seconds after any blip of the throttle. FWIW, this problem emerged after a street port rebuild, and the install of a lightweight flywheel.

My mechanic adjusted the various idle settings and - for now - I'm good to go. Sorry, I don't have specific details of adjustment... I just want everyone to know that this problem may be solved using PFC adjustmets.

 

I had the same bouncing idle. The car would idle at 2000 rpms on a cold startup and would take FOREVER to come down to 1000 rpm. Then it would bounce between 1000 and 1500 everytime I came to a stop. Today, I unplugged the idle speed control and the car cranked and idled exactly like it should. I thought everything was perfect until I let the car warm up and drove off. On my way to work, everytime I would have to stop for either traffic or a light...the car would idle between 400 and 500 rpm and almost stalled a couple of times. As I pulled into the parking space at work, it stalled out. I went and got a screwdriver and was going to adjust the valve underneath the throttle body when I remembered that a local guru had once adjusted my idle at a different spot. Just in front of the throttle body there is a small screw with a nut tightened around it. I loosened the nut and adjusted the screw, and now my car idles solid as a rock between 900rpm and 1100 rpm, depending on the ac/electrical load. I don't know if this will help anyone else, but I figured I would post up my experience.

 

took off the white plug on the ISC, solved my idle problem right away. If you are still haveing problems try changing the idle settings.

Bob