How do i know if im hitting the FCD?? (fuel cut defender), my car ('88 13bt) farts and misses sumtimes when its under stress like heavy acceceleration or underload goin up a hill or sumthin. Would this be the FCD or possibly fouled plugs or HT leads beaking down, This usually only happens at hight revs. It has a turbo back 3" exhaust and an HKS filter. Also if this is the problem...how do I fix it?? is a really bad thing to happen?