I have a 2001 cobra and whenever I am coming to a stop or just push the clutch in when rolling the idle will instantly drop to about 300 then it will come back up to 600 then drop back down to 300 and then come to a normal idle around 700 after a few times of it dropping off, I have already cleaned the Maf, throttle body, put a new IAC on but still didn’t fix the problem.

 

I too have this problem, I believe it may be due to a bad EGR