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  1. Idling rough, high oil pressure, service shop could not diagnose with out codes..

    Engine Tunes/Mods
    Ok not sure if I am in the right forum but here it goes... I have an 03 Trailblazer LT EXT 118,000 miles... it has been idling rough for a few months..the hubby changed the spark plugs and found oil on the threads...getting really bad gas mileage...oil pressure is higher, ranging between 40-60...
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