Hello I have two codes that came up at the same time. PO102 & PO443 I don't know if they are connected or not. The truck takes a while to start, sometimes but not all the time, and the tranny shifts hard know. I know I have no air leaks so I don't know what else to do. Its a Silverado 2500 HD with a 6.0 2 wheel drive.

Then it's time to do a little close looking at connections to MAF sensor. A lot of times when this happens, it ends up being a bad connection somewhere, either at MAF or at ECM. Unfortunately part of the testing requires scan tool. It may have to go to dealer for this, unless you've got a local guy who knows what he's doing with a scan tool & you trust him. If you do decide to remove connectors & spray them with contact/electrical cleaner & inspect close while doing it, be sure to disconnect battery, & apply dielectric grease to connections before re-installing. Good Luck, Sorry I couldn't be more help, but I think that will be your fastest & probably cheapest way to isolate & remedy the problem.

Then it's time to do a little close looking at connections to MAF sensor. A lot of times when this happens, it ends up being a bad connection somewhere, either at MAF or at ECM. Unfortunately part of the testing requires scan tool. It may have to go to dealer for this, unless you've got a local guy who knows what he's doing with a scan tool & you trust him. If you do decide to remove connectors & spray them with contact/electrical cleaner & inspect close while doing it, be sure to disconnect battery, & apply dielectric grease to connections before re-installing. Good Luck, Sorry I couldn't be more help, but I think that will be your fastest & probably cheapest way to isolate & remedy the problem.

One other thing that appears to be a culprit for those codes and part replacement didn't cure it, is plugged exhaust. A plugged converter has been found to cause it more than once. Just something to keep in mind.

One other thing that appears to be a culprit for those codes and part replacement didn't cure it, is plugged exhaust. A plugged converter has been found to cause it more than once. Just something to keep in mind.