GMC Troubleshooting Questions? Ask a Mechanic for Answers
definitely need to look at the p0300 first as a misfire will cause a transmission to do bizarre things. Do you have acess to a scan tool to see which cylinder(s) is misfiring?
06should be an analog abs wss, so disconnect it and set your meter to acv then connect between pins on the sensor have someone spin it by hand and you should see 90-180mv
so is it still missing?
did you reset the shift adapts after replacing the tranny?
it should be in output controls if you scanner can. Yah first deal with the misfire though that can cause some crazy shifting, move the coils around and try
sorry i was out o town over the weekend. You need intake gaskets. Pour a gallon of water down either side of the intake and see if the misfire worsens or steam from the exhaust, these are really common and 99% of the time the cause of lean codes.