Jharry

2003 silverado with LS1 from ws6 trans am. All stock except headers, no cats and magnaflow. I recently replaced fuel pump and truck ran fine for a week. Took a road trip and 100 miles in I get a flashing CEL. I pull over and scanned it and got p0307. I cleared code and resumed trip. Truck seemed to run ok but it wouldn't shift into over drive. Eventually it shifted into OD. Had the CEL flash several more times and each time it was p0307 and it wouldn't shift into OD for a while. One time I had p0300. I couldn't tell any performance issues. Just not shifting. Had a friend check with his scan tool and no codes. We switched coil around but still had p0307. Injectors are new. Has new MAF & MAP sensors. No vacuum leaks. At a loss because it's intermittent.

Iam Broke

#7 plug may have a whisker or be fouled.

Jharry

The plug was fine. The only thing we didn't do was switch injectors. Just odd that problem is intermittent

Jharry

truck being scanned at dealer as we speak

Jharry

Just back from the dealer and they couldnt find anything wrong. No CEL or anything. Really getting frustrated but on the bright side, the trip to the dealer didnt cost me a dime, they said since they couldnt find anything amiss that they were not going to charge me. I was shocked!!