351W car hesitates & backfire through carb. HELP!
I have a Shelby Cobra replica with a 351W motor. Before I put the car away for the winter last year, it started to hesitate upon acceleration and backfire every so often through the carb. The carb is a Holley 750. Car has 15k miles on it and has been perfect until this! I garaged the car for the winter and took it out this year and it's doing the same thing. HELP! I've had it parked all season. :( I have replaced all of the fuel filters and this did not help. The fuel pump is a Holley racing pump so I heard these don't die at all! What else can it be?
When I try to rev the motor, it hesitates as if there is a delay. When the car is off and I push the gas, I get a steady stream of fuel in the carb so I don't think it's accelerator pump.
PLEASE HELP. I WANT MY CAR BACK!!!