300 six stumbles - Off-Road Forums & Discussion Groups
Ford 67-96 F-Series, 78-96 Bronco All discussions of 67-96 F-Series Trucks and 78-96 Broncos

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post #1 of (permalink) Old 12-04-2005, 04:41 PM Thread Starter
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300 six stumbles

I forgot to ask this in my other post. It's still the same 1990 f-150 and it stumbles when it's idling. Not all the time but once every couple minutes. Also i changed the plug's and they are white looking. would't this be a lean condition or do all the efi 300's run like this?
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post #2 of (permalink) Old 04-17-2009, 04:24 PM
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91 f-150

I have a 91' w/ 300 and have the same problems. I have linked the white spark plugs to overheating, not sure if this is whats causing your problems but could be an idea. And as far as stumbling at an idle, pretty much the entire stock fuel delivery system is suffering, ive seen injector and hose replacement fix the problem. Mine will stumble and bog when in gear but due to a tranny about 10k miles past needing to be replaced.
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