Hope someone can give me some ideas.
I have a '14 Sierra (5.3L,2WD) with 151K miles. About 30K miles ago I changed the plugs and wires and about 5k miles ago I had a coil go out on me, but I only replaced 1 coil.
I currently have a slight misfire. It runs fine at idle and at WOT throttle. But when I'm at part throttle, I will feel a slight miss that gives me a light buck. It is not severe enough to throw a code, and I have not noticed a significant drop in gas mileage.
Should I start by replacing all the coils? I know once 1 goes, the rest are soon to follow. Or could this be a sensor or something else?
Any help or insight would be great.
Thanks in Advance!
