I recently got a cel 25 which was the idle air controller. So i looked at it and it was loose and I just plugged it back in. I reset the ecu and the cel went away. Then I had a short running from my battery which caused my car to shut down when i was driving. I fixed that and now my car is hesitating at 4000 rpms. It will boost fine up to 4 psi but then it starts to hesitate at around 4000 rpm and then when i let off the gas i'll feel a surge and the car will go. The hesitation only occurs when i'm wot or when the i pretty much give the car a lot of gas. Any ideas on what i can do to get rid of the problem.

what did you do to address the MAP sensor seeing boost, do you have the black box or missing link??

have you checked/changed plugs lately

Sorry, I should have put all this info in my first post. I have the missing link and I just changed my wires 3 weeks ago. 3 weeks before that I changed my coil pack, and 3 weeks before that I changed my plugs. It seems as if every three weeks or so I get this hesitation and when I change one of the 3 things it seems to work for a while and then it craps on me again. I don't feel like changing my wires or plugs every 3 weeks so it has to be something else that is causing this.

thats funny, i got cel 25 and the only place it hesitates less is at 4k... check my other post.