Hi all, Im new to this forum and just purchased an 01 GTP about a month ago. The engine idles smoothly and seems to have good power under normal driving conditions. When boost is applied the engine responds well until around 4000 rpms. It hesitates from 4000-6000 rpm. The cabin, especially when the sunroof is open or the windows are creaked begins to smell like sulfur. The catalytic converter doesn't seem to glow or anything like that and i have no CELs or codes being thrown.The engine was running stock wires and copper cores and seemed to run smooth enough with the exception of this problem. I replaced most of the ignition system. AC Delco Iridiums gapped to .060, New MSD Red Stock Wires, replaced all three coil packs and the ICM. I also replaced the upstream 02 sensor with an AC Delco sensor. I have checked the wires and plugs over and over and cant seem to find a problem. I would greatly appreciate any other suggestions you guys could toss my way cause i love everything else about this car.
oh yea, forgot to mention, 86,*** miles & the coils are off of an L36. If that makes a difference. I've got like 10 of em laying around. (The l67 coils that came with it had rusted electrodes and the 1,4 coil was cracked)...
