1997 - 2003 F-150

Engine idle high after tune up?

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Old Dec 4, 2011 | 09:16 AM
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From: SOFLA
Engine idle high after tune up?

I just tore apart the top end and cleaned everything and replaced plugs, filters etc. I also replaced the battery but now the engine at idle is around 1050-1100 rpm. Can't figure out why. My mpg dropped to 13.25 from 14.5 highway. Guess I was only running on a few cylinders. Any suggestions why idle so high and how to fix without going to the dealer. TIA
 
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Old Dec 4, 2011 | 12:20 PM
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glc
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From: Joplin MO
Which engine?
 
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