Do you have a h-pipe in your Mustang? If you do check to see if it's your h-pipe hitting the underside. I know I had the same issue and I put a piece of heat resistant rubber in between and problem solved.
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93' Mustang w/ a stock 302 block, E303 cam, 3.73 gears, Pulleys, Edelbrock Performer upper and lower, Edlebrock 70mm throttle body, gt40 heads 1.94 intake, 1.60 exhaust, 1.6 roller rockers, American Thunder exhaust, BBK cold air intake, BBK off road H-pipe, BBK 1-5/8 shorties, AOD with shift kit and 15* timing.
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