1999 Chevy Tahoe. Distributor keeps reading out of time without being moved. I set #1 cylinder top dead center and adjust timing. Truck runs good for a week and then starts rough idle again(distributor goes back to being off time with scanning tool). Any ideas? I have done this twice already. Could the distributor be bad? Any suggestions would be appreciated.
Saturday, November 19th, 2011 AT 10:26 PM