Quote:
Originally Posted by gcredantporsche
I tried replacing the AFM with another from a 3.2 that was working fine, and that did not change the surging idle. I did another smoke test and noticed a tiny amount of smoke coming from behind the rubber boot below where the rubber Y joint is, but for the life of me I could not pinpoint it because even with a mirror and light it was hard to see. So I replaced the rubber y-joint that has the two small hard lines that come out of it going to the fuel damper and the other side (regulator?) which was easier to get to with everything removed. I then put everything back together and also tightened up everything I could in terms of vacuum hoses and clamps. I then drove the car around until it was warm, and noticed that the warm idle was running at about 1100-1200 rpm. When I got home, I jumpered the B / C to bypass the ICV and the engine was slightly surging. I reduced the idle down to 850 RPMs and then drove it around again, and it ran great. I also removed the oil cap and noticed the idle changed when it was off (which wasn't the case previously). I let the car cool down for at least an hour and when I started it up, there was no more surging. Hopefully I solved the vacuum leak! Thanks everyone for your help and advice.
I also had a thread on rennlist which was also helpful.
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Glad you found the air leak, as noted per post #15.