My 2001 Taurus has trouble maintaining normal RPMs when idle after warm. It will hover around 900-1000 rpm then suddenly drop to 300 then catch itself and come back up. Seems to get worse the longer it is driven. We have replaced the spark plugs, plug wires, coil pack, and fuel filter. When testing the fuel pressure from the engine port there was no issue found. doesn't seem to be a vacuum leak because we sprayed the entire intake system and it did not change the idle. Any help would be great!
Could be IAC sensor maybe TPS sensor[RPM].
SOURCE: what causes 2000 taurus engine rough idle but no codes
remove neg. cable from battery so the ECM will reset this may work. make sure the IAC is air tight. if this doen't fix your problem have someone check the IAC valve if it's bad the part runs $300.00 pluse
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Sorry, I forgot to mention that I replaced the IAC already and there has been no change
Sorry I forgot to mention that I had replace the IAC as well and there was no change.
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