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did you guys replace your ECTS
the ECTS (elec coolant temp sensor) can cause this also by giving errant temp readings, the pcm uses the temp to set fuel mixture
if its failing/corroded voltage readings can jump around and give you this type of problem..high revving (then it will settle down)...also you may be getting bad gas mileage and rich exhaust...for some reason green/decaying ECTS's don't set a code on SES probably because they don't actually "fail, i.e. ground out" they just corrode and give ERRANT readings...
replace them and see, they cost less than 10$ at advanceautoparts
the autozone here in my area sold the plastic/cheapie type
advance had the brass one
go for brass
or order online from saturn or goto the dealer
don'tuse the plastic variety they are real junk
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