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Old February 7th, 2012, 11:41 AM   #1
78ford460
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1988 f-150 high idle

I have a 1988 f-150 with a fuel injected 302. The problem is, when it is in park and neutral the motor will idle around 1300-1500rpms cold, and when it gets warm it will idle between 1600-2000rpms. When the truck is in drive it will idle normal around 800-900rpms. Anybody got any suggestions. Thanks.
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Old February 7th, 2012, 12:04 PM   #2
94cherokeemike
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Throttle position sensor had the same problem on my buddys 88 F250 and my grandpas friends 89 E150. Have you scanned the codes yet?
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Old February 7th, 2012, 12:28 PM   #3
Elvis13
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http://oldfuelinjection.com/

This should help you check/read codes.
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Old February 7th, 2012, 03:37 PM   #4
78ford460
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I was thinking a vacuum leak or the tps. thanks for the help.
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