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Old 10-11-2011, 01:05 PM
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Hesitation/Bucking problem

I own a '70 GTO and have been having a problem where my car hesitates and bucks back and forth whenever I come to a stop and try to accelerate. I have totally cleaned, blew out and rebuilt the carburetor as I initially thought it was the accelerator pump. I purchased a trick kit and have tried separate nozzle sizes and cams with no luck. I have it timed properly and just can't figure it out. I did have some varnish in the secondary, but I also have a light foot and don't drive it too much with work and school. I replaced the fuel pump about 2 years ago and right now I'm thinking I have clogged fuel lines as it has become hard to start if I don't pour a little bit of fuel into the top of the carb. It idles great and never dies so I'm confused at this point.

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Old 10-21-2011, 08:24 PM
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How are your plugs? A cheap inline fuel pressure gauge will help to see if you have enough pressure to your carb. Check for vacuum leaks as well especially if you have power brakes, since you said the car hesitates after a stop. My LeMans had a problem similar to yours after stopping and then accelerating but it was due to a problem with my auto trans th400 with a bad pump. Just throwing that out there. New set of plugs is where I would start especially since you found varnish in the secondarys.
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