Auto transm.stays in 4th gear all the time.d4 on panel was blinking.i had local mechanic do diag.scan since check engine light was on.mechanic said check tcu and ecm.i had both tcu and ecm refurbished with reputable company. still have same symptom except d4 no longer blinks.if u manually shift to lower gear car begins to miss and sputter badly.car runs ok in 4th gear (except for no power from dead stop) until u reach 70 mph then missing and sputtering starts.
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