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69 Posts
First post need help with bucking on accel.-UPDATE
This is my first post on this Forum, came over from one of the Corvette Forums. Hopefully we can help each other out. I posted this in the other Forum and so far have not got to root cause.
My 78' 4 speed has started bucking during acceleration. Worst at part throttle. Lars just rebuilt the Q-Jet (it did it before he rebuilt it too). I have installed the Lars recommended vacuum advance and set timing per his paper. Still does it. I removed my MSD distributor and box and installed the bone stock 78' HEI. Still does it. It idles fine but seems to misfire during off idle light load. I have not touched the carb since Lars rebuilt it (though it is tempting). Compression is 160-170 on all cylinders. Installed new plugs also. Tried retarting timing, no vacuum advance=no improvement. It has good power once it gets past the bucking. Where do I go from here?
Anyone have any ideas?
MY UPDATE IS AT THE END OF THE THREAD.:cheers:
This is my first post on this Forum, came over from one of the Corvette Forums. Hopefully we can help each other out. I posted this in the other Forum and so far have not got to root cause.
My 78' 4 speed has started bucking during acceleration. Worst at part throttle. Lars just rebuilt the Q-Jet (it did it before he rebuilt it too). I have installed the Lars recommended vacuum advance and set timing per his paper. Still does it. I removed my MSD distributor and box and installed the bone stock 78' HEI. Still does it. It idles fine but seems to misfire during off idle light load. I have not touched the carb since Lars rebuilt it (though it is tempting). Compression is 160-170 on all cylinders. Installed new plugs also. Tried retarting timing, no vacuum advance=no improvement. It has good power once it gets past the bucking. Where do I go from here?
Anyone have any ideas?
MY UPDATE IS AT THE END OF THE THREAD.:cheers: