Can't diagnose idle surge. Last weekend I was racing and the screws came loose in my fuel pressure regulator causing fuel to be sprayed everywhere under my hood. I pulled over, tightened the screws and got back on the road, car was running good except for an idle surge problem that wasn't there before and a high idle. I reset the ecu, didn't help. So then I checked for vacuum leaks, didn't find any. Then pulled of my iacv and ficv cleaned them and the screw was all the way out in the ficv. Screwed it back and replaced the coolant line goin to the ficv because of a leak. Put it back together and started it, it ran fine until it warmed up and went into closed loop idle, the idle surge was still there. It's a boosted b20 tuned on Crome with a gm map. Any suggestions. Could my tune have gotten thrown off by that. Thanks

 

Bump.

 

possible fuel pressure issue?

 

I've got a guage on my regulator, it's right at 38psi, drops a little with the surging

 

Any other suggestions? Just don't understand why my car ran fine until my regulator came loose

 

bump

 

Thanks, guessin ur having same problem