did tune up and I still have MIL light on

1999 GMC JIMMY
93,000 MILES
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JMV7680
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1999 GMC JIMMY 4.3L, PO 300 REPLACED PLUGS, WIRES, CAP AND ROTOR, STILL HAVE MIL ON, AND ROUGH IDLE, WHAT'S NEXT? I have done tune up, i am reading about possible injector problem, whats the most common?
Nov 7, 2011 at 6:27 PM
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