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Old 05-11-2008, 06:52 PM
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stumbling 2.9l

i am having troble with my 86 bronco ll stumbling hard when warmed up. emissions passed really great, cats are not bad(took them off and still had the problem), intake air temp sensor replaced, timing is good. its something temp sensitive, runs fine when cold. what might this be???!!!???thanx a lot all help is appreciated

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Old 05-11-2008, 06:59 PM
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ur thermastat maby ?
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Old 05-11-2008, 07:11 PM
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stumbling 2.9

the sad thing is NNNOOOOO i didnt even think of it thanx a yillion
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Old 05-11-2008, 07:16 PM
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no prob bud
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Old 05-13-2008, 02:03 PM
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thermostat is replaced and its still screwy
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Old 05-13-2008, 02:29 PM
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try the coolant temp sensor.. sounds like it's reading a low coolant temp, causing it to stay in open loop, which is designed for warm up and will run rich on a warmed up engine.
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