quick question..have 94 coupe,manual trans.under 3000 rpms cars feels like a 4 cyl.above 3000 rpms she runs fine..we ckd all the sensors,eveything all show working fine.. maf fine.. etc...put in a new computer and car ran fine.. but after 15 mins computer bugged out and car went back to doing the same thing.. someone suggested that the exhaust was clogged.. took disconnected the exhaust and the motor was running very rough,would not drive at all.. connected exhaust back up and back to the same problemm anyone out there have any ideas what the problem might be or any suggestions on what to ck orm try thx v