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Old 09-02-2008, 12:54   #1 (permalink)
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351W car hesitates & backfire through carb. HELP!

Hi all,

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!!!

Thanks.
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Old 09-02-2008, 15:44   #2 (permalink)
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Re: 351W car hesitates & backfire through carb. HELP!

Someone PLEASE help!
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Old 10-06-2008, 10:11   #3 (permalink)
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Re: 351W car hesitates & backfire through carb. HELP!

Maybe check or replace your distributer cap. Had the same problem with my Camaro once.
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Old 11-27-2009, 22:29   #4 (permalink)
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Re: 351W car hesitates & backfire through carb. HELP!

This issue sounds like timing issues had my vac sec Holley carb doing this one time,

Small list of checks to do
1.replace disturber cap or check for carbon tracking.
2.Make sure the disturber bolt is tight on the motor if it's not chances are times out a few degrees
3.if this stuff checks out check vac lines on card for a torn hose or a vac leak.
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