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chaig49 5/2/2013

1989 Ford F-150 XLT Lariat 8 Cyl 5.0L


why when starting rpms race up and down between 500 and 2000 for 15 to 30 sec.then either stalls or levels out at 500

will do 90% of cold start times
will do 40% of med.cold times
no check light on
no other warning lights
r&rd idle air sensor and cleaned with gumout
bellows and piston good shape

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