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Vehicle hesitates and cuts out at 3K rpm under hard acceleration

C

clintmopar

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Apr 12, 2014
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Lorena, TX
Hope that you can give me some help. I have plugged my vacuum advance and changed my orange box and I am still having a bad hesitation and it cuts out. When it occurs let off the gas and feather the gas and it runs fine again. Happens worse on hard off the line acceleration. I have a 68 Road Runner with a 383 and auto trans. Has a Mopar Electronic conversion ignition with orange box, eddy 750 carb, headers, small thumper cam, stock fuel line, pump and filter. Wondering if I have a ignition or fuel problem?
 
Sounds like fuel to me. Has non stock cam, carb and exhaust. With stock fuel system.:gah:
weak/bad pump and restrictive filter could be it.
 
If you have a tack installed does it gain or lose rpm when this occurs?
 
My old 62 Savoy afb used to do this. I would hange the accelerator pump in the carb and all would be fine.
 
I would check fuel pressure and float levels for starters
 
Try putting some more timing in it, Then see what it does. I changed mine from 12 to 18 initial, made a big difference.
 
kdtjb said:
Try putting some more timing in it, Then see what it does. I changed mine from 12 to 18 initial, made a big difference.
Click to expand...
I do not think he has enough cam to justify anything over 12. Also he needs to hook the vacuum advance backup and check for proper operation first. Will need a timing light and tach. 18 degrees initial will work the heck out of the starter on hot starts and I have found no justification for it with the type of ignition he is running if everything in working like it should.
 
With all of these ideas, he should have it fixed in no time and I am real curious to see what the actual problem really was.
 
stock fuel pumps are 3-5lb pumps and most won't make 5lbs. and, to add to the misery folks will put a filter on the suction side of the pump. this is the first i'd look because it sounds like fuel starvation.
 
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