Question about 1991 Ford F150

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When i unplug the tps sensor runs smooth but plug it in up and down rpms

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Sounds like the EGR valve and pdfe senosr they control idle speed.

Posted on May 02, 2010

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Posted on Jan 02, 2017

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If defrost is on that means AC cycles to remove humidity. Does this also occur when ac is running set at very near outside temp so it cycles? Could be the throttle positioning sensor (TPS) acting up.

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it sounds like it's the idle air valve this controls the idle and drive rpm's when you step on the gas does it sometimes at idle go up & down by itself repeatedly? it could be something hitting the throttle and when you press down on the gas or shift it is knocked out lowering to normal idle/rpms, the tps is on the throttle body and is connected to the throttle lever and most likely right on the other side of the lever a little switch with a electrical plug on it search it so you can see what it looks like if you don't know already they are sealed and can not be cleaned you must replace it try checking with the car in park engine running and raise the idle by the throttle lever if it goes smooth up and down return to rpms that's not it if it races or sputters and then raises up that's it or it could be both units are blown out needing to be replaced

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it could be due to a malfuntioning tps sensor or a stuck throttle linkage. the tps is located on your throttle body and has a 2 or 4 wire plug the throttle linkage is located in the same are have this looked at... please rate this

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