check for vacuum leaks first ... clean the MAF, and IAC valve, check/replace airfilter....
as said before, it COULD be the beginnings of VANOS seals failure ... you can unplug the intake side vanos solenoid and if the problem stops, then that is likely your cause...
do you have any cold startup idle issues?
Originally Posted by billgti
with the car in drive (e.g. stopped at a traffic light) and with the AC on, the idle surges by a couple hundred rpm and the car shakes very noticeabley. happens every 5-10 seconds or so. gets worse with the AC cranked up to max. doesn't happen when the AC is off.
what's going on here? Idle control valve? give me some ideas guys. thanks.