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Originally Posted by shlbsnake
I have a 427 center oiler in my car and I love it, but lately it seem to sputter if I try to stomp on it. I replaced the plugs which looked to be burning good, and it seemed to help for a bit then it started doing it again. This is the first fe I have messed with so any help would be appreciated. The build up is a 66 CO block displacing 454 CI. it has edelbrock heads which I believe are stock with no mods, a 750 single pump carb and dual plane edelbrock intake. I have MSD 6al box, MSD dist. taylor wires the cap and rotor look good. I am thinking mabey a fuel problem??I am using a mechanical pump.The charging system is working well But I am still not completely ruling out an ignition problem. It does almost feel like a miss. PLMK if anyone has any ideas.
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go through the basics first..
While standing by the car I'd run the engine and try an duplicate to problem with the air cleaner off. I'd look and see if the vacuum secondaries are opening and the squirter(s) is/are pumping fuel on initial throttle opening. If you can duplicate the stumble, have someone immediately kill the engine while it's stumbling. Pull several random plugs and see if they're fouled or bone dry.Bone dry would be my guess.. (fuel problem)
From there, assuming nothing previously pointed to the problem, I'd go into some simple checks.
Check your plug condition (gap, condition and coloration to indicate fuel/
oil burning) Double-check your ignition timing, 10-18deg BTDC. Check both primary and secondary carb float bowl levels. Pull your MSD distributor cap and see if the contacts/carbon button looks good. Take a look at the rotor for evidence of excessive arcing. Hook up a temporary in line fuel pressure gauge to see if you've got a failing fuel pump. There's a lot more "detailed" things that can be checked but this should reveal something..
Dave