Rough Idle
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Senior User
Joined: Jan 2011
Posts: 145
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From: Dothan, Alabama
Rough Idle
Does anyone associate the use of 10% Ethanol gasoline and rough idling? I just recently had idle issues and had the power valve replaced and a vacuum leak. I had those issues fixed and today it rough idled again. I sprayed some carb cleaner in the carb and the rough idle went away...I am wondering has anyone else had issues with varnishing or build up. I know these engines are not made for ethanol but ethanol free is few and far between. I didnt know if I just need to start using exclusively ethanol free gas unless im in a pinch.
Thanks
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Senior User
Joined: Jun 2012
Posts: 290
Likes: 1
From: Southern Ohio
I used E-85 in my f100 and it ate all the seals up in my carb and ate up the rubber fuel line! Ethanol is some horrible stuff. When I used it I got 10 mpg and when I switched back to normal gasoline I got 16 mpg. 
Post Fiend
Joined: Mar 2011
Posts: 8,501
Likes: 4
From: Lynchburg, VA
To answer the OP, I haven't run into a problem, although some trucks are pickier than others.
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