My 41000 mile 96 cobra is stock except C&L MAF, gears and magna flow mufflers. inconsistantly sometimes it will surge when on the throttle(not WOT), below 4000. It will feel like its pulling hard and then fall on its face and pick up again. its inconsistant and i had the same problem with a 90 with a C&L. anyone else have problems with them? i heard alot of people say there junk? any help?