Codes changing why?
Truck starting acting up about a week ago. Truck on friday was have a hard time excelerating up small hill and was hesitating. Friday night code read p0304 so i change the plugs, wires , rotor and distributer cap . Started truck after done rumbling when started bad rough idle. code then read p 305/ put back old spark plug in cylinder 5 now still rumbline and rough, code now reads p 0300. please help
Cars & Trucks - GMC - Yukon - 1999 GMC Yukon
Answers & Comments
There are many possible causes. Make sure you have the right firing order. Look for vacuum leaks--maybe intake gasket. Read at the link below, starying around the middle of the document.
Do It Yourself Diagnosis and Repair