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Recently did tune up and now idling at 1200 at operating temp. Also, gas mileage went from
14.5 to 10. performed reg. tune up with NGK plugs and cleaned throttle body. Does anyone have a guess as to what I did wrong???
 

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Sounds like a leak on the intake. I would spray ether around the fittings to see if the rpm's change. Also you may have to do a throttle close learning procedure
 

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Throttle position learn, idle air vol learn can be done manually without computer assistance. Do a search and you'll find the threads.
 

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