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Old 09-01-2004, 02:50 PM
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new engine smokes and stumbles

I have a problem with my 68 ford 302. I get a little white smoke when I start the car and when I drive and shift under load. Also I am having trouble with a stumble off idle under load at about 1500 RPMs then it picks back up. This is when driving economically. My plugs also show carbon indicating rich mixture but I don't get black smoke. The engine has less than 100 miles on a pro performance rebuild. Here are the specs.....
Street/Strip 1964 Falcon 302, 4spd, 3.25 gears soon to be 3.70s.
Balanced, bored .030, Speed Pro forged flat top pistons , Edelbrock RPM package, Cam specs Int. .496 Exh .520 duration 290,
Edelbrock RPM aluminum heads 2.02 1.6 valves
headers, msd ignition with stock distributer with igniter electronic conversion. lighter advance springs,
Holley vacuum Secondaries 750cfm w jets 2 sizes down,
Timing is 11 degrees initial and 34 degrees total.
I adjusted the floats to bottom of sights and tuned the mixture screws it to best vacuum reading of 10hg at idle. The car runs strong when you get on it and doesn't miss but just stop and go cruising is when it stumbles a little. Any help would be appreciated
This is my first performance engine tuning. thanks

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Old 09-01-2004, 04:55 PM
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Increase ignition advance and you will probably get rid of it. Try a pink pump cam. You can also increase shooter size two numbers.
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Old 09-01-2004, 07:26 PM
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You say new engine. Were block and heads checked for warpage?
Please provide rebuild details.
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Old 09-01-2004, 10:24 PM
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if you have an auto trans, it could be a bad modulator, and you're sucking ATF into your engine.
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Old 09-02-2004, 04:57 PM
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This is a manual Trans, The heads were brand new edelbrock out of the box and the block deck was checked. Should I wait till I change the gears from 3.25s to 3.70s berfore I change the pump cams or squirters? Also I am running a Holley mechanical fuel pump and I put a fuel pressure guage right before the carb and When the car is running for a while and idleing it reads 0 psi. Is this right, or should I look into the fuel pump?
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