I have an '02 tahoe LT with 80,000 miles. recently it's had intermintent problems running really rough. it seems to idle really high or when it comes down it idles really rough. I had it put on a computer and it seems that it's mis-firing on the #6 cylinder. I put new plugs and wires on it to see if that would help but no success. the weird thing is that it doesn't do this all the time. I'm leaning towards some sort of electrical problem but just wanted to see if anyone had run into this same problem.

 

wat dtc are u reading?