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I have a 2002 Cey Tahoe 5.3 liter 4wd flex motor. Service Engine light on Po codes 171 & 174. Changed MAF sensor,Air Filter, Spark PLugs and Wires, BP gasoline anda bottle of heat. Still acts like it wants to shut off when idle, orwaiting ata light. If i hit itit takesoff like light but runs...