81 F150 stumbling issue

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Oct 27, 2007 | 08:37 PM

GELGIN58

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81 F150 stumbling issue

I have taken all of the emission stuff off of it,I have no vacumn leaks,and have replaced the carb,stock 2 barrel.No catalyic converter.Timing is OK,yet stumbles under load. Vacumn advance is working. My first guess is the distributor. It is the original with 183,000 miles. Any thoughts?

Oct 27, 2007 | 09:09 PM

Franklin2

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It stumbles as soon as you hit the gas, and then smoothes out? Or does it buck constantly as you are pulling a hill and holding the gas steady?

What engine is this, and you just replaced the carb with a new one, or a different one than was on it?

Oct 27, 2007 | 09:21 PM

GELGIN58

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Stumbles under load,like going up a hill. Smoothes out when I back off the gas. Replaced carb with the same kind. 302 V8 i

Oct 27, 2007 | 09:27 PM

Franklin2

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The first thing I would change is the fuel filter. I believe you have the type that screws into the carb correct?

Oct 27, 2007 | 10:23 PM

Ron Kelley

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Yes to the fuel filter. It could have enough flow to run the engine at idle but with a partial blockage it would not have enough flow to run under a load. I had this scenario a few months ago.

Oct 28, 2007 | 09:37 AM

GELGIN58

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Forgot to add...already thought of that and did ....no change...

Oct 28, 2007 | 01:19 PM

Franklin2

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If you take the vacuum advance off and plug it, does the timing still advance when you rev the engine? (It should).

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Nov 2, 2007 | 10:24 PM

Franklin2

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Quote:

Originally Posted by biga17133

Franklin2....

Could his ignition control module be going bad (shorting out) just thinking out loud..

That failure is usually heat related.

Nov 2, 2007 | 10:33 PM

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Singlespeeder

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What If the dist. had loose bushings and is no longer running in a round circle but was loose in its hole 183,oo mile thats a lot of rotation for a dizzy