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i had a s10 several years. eventually, it would idle bad. as time went on, it would go dead at stops. i used cheap injector cleaner 2 times with no result. i purchased the most expensive chevron cleaner and it cleared up. also, there should be an idle air speed solenoid which could have a problem on your vehicle. if it idles lopey, it could even be a vacuum leak. i had a f150 which loped. after 2x in the dealership and 600.00 later, i myself, found a vacuum leak because it made a high pitched whistling sound in cold temperatures.

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