Hey Whats going on Chevy enthusiasts. Ive seem to run into a wall with my P0303 problem, wondering if you all can chime in. Here is the issue. I have a 2007 silverado 2500hd vortec 6.0 engine. I got the check engine light on. OBD read P0303 (cylnder3) mis-fire. Ok so first thing a I did was change the cylinder 3 spark plug (still mis-fires) then I checked for spark on the coil and yes it has spark (still mis-fires I checked the spark plug wires and they seem ok. I also changed the Fuel injector (still mis-fires).
What else do you think I should check? I hope I dont have low compression my engine only has 91k miles....but shit happens.
Chime in let me know what you think...
Much Appreciated...
Oh by the way Im new here