I put a 75mm Pro-m bullitt on my car a couple of months ago and the car ran like crap. Poor idle quality, surging and detonation. I took it off immediatly and sent it back for a refund. Last week I put in 30# injectors, C&L 76mm mass air and a Kirban afpr. The car ran great except for a funky surge at just off idle throttle and lousy cold start. I cured this problem by buying some window screen from a hardware store and intalling a piece in front of the mass air inlet. Since the stock units have this I figured it must be for a reason and felt I had nothin to lose. Too my surprise it worked. Any of you guys that have had this issue should give it a try.