The Stallion is acting up again. Condition's I have detonation from evidence found on the plugs as little black speckles. My timing has been checked time and time again. I have checked fuel pressure, replaced th o2 sensor's, checked MAF sensor. The car back fires out the exhaust at about 5,000rpm and loose's all power. I put a scanner on the car and I pulled a code 44-Thermactor air system fault, can anyone tell me what that is and if it could be causing this problem. Timing was @ 14 but is now @ 8 with the same results. I replaced the fuel filter as well with no luck. I have lik all the conditions Lean/Rich & detonation. keep in mind it isn't the mass air.