While driving my 89 GT, I get a hesitation while accerating then it will take off like a cannon. Once I slow back down it does the same thing again. I have replaced the fuel filter & checked the wires. Would the map sensor have anything to do with this matter? Mods are B303, Cobra intake, throttle body & mass air. No fun driving it at the moment. Someone please step in and advise. Any assistance would be GREAT!!!