I installed a new motor in my 1995 Cobra. The motor is a 1988 gt blocjk with trick flow heads ported stage 3, hardened pushrods, 1.6 roller rockers, motorsport B303 cam, stock cobra fuel and intake. Car dies on decelleration and rough idle(rougher than anything else I have ever seen. Also this is the part that confuses me stong vacuum through oil dipstick any suggestions? Does anyone think intake gaskets slipped??? Clueless. Car runs and pulls hard just dies when decellerating