I have an 03 GMC Yukon 5.3 it won't go past 30 MPH check engine light flashing and has a rough idle almost dies Please help!!!!!

Asked by Jun 14, 2014 at 07:35 PM

Question type: Maintenance & Repair

Changed fuel pump o2 sensors spark
plugs intake gaskets crankshaft

2 Answers


Did you have the check engine light codes read? If not then have them read. This will give you clues as to what is wrong with it. Post them back on here and we can help.

2 out of 2 people think this is helpful.

A flashing check engine light means that the engine is misfiring and damaging the catalytic converter. As dandy said, post the codes and we can help further. -Jim

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