I've just put together my 86 mustang.. stock block, forged internals.stock ported heads,SSI intake w/70mm TB, full exhaust..(shorty headers,2 1/2 x-pipe,borla cat back) F cam, 3.55 gears, rebuilt trans with hardend internals.Paxton novi 1000 with 2.75 head unit pulley and 8" crank pulley not for sure boost yet...any ideas? But heres the problem I can't get it to idle right no matter what I do it surges up and down like its trying to correct itself. I messed with timing its good, adjusted the throttle body no luck there either???I still am runing the factory MAP sensor..could that be my problem?and Why? Could I get a "chip" to fix it? Lots of questions but cant Find any answers.Its seems I've already check everything cleaned the throttle body, changed throttle postion sensor , no vaccum leaks,good fuel pessure?? I don't know has me scrathing my head? Any ideas would be appreciated..Thanks