[white99ta]

These codes showed up after I put my new transmission (4l60) in my 1999 trans am. I had the battery disconnect but had to reconnect it before it was done to roll up the Windows( didn't have the rite tc bolts so had to finish the next day, I was at my hobby shop on base) anyway I connected the batt and forgot it was connected and arced out the starter. Don't no if that has anything to do with the problem but now the lights flicker. I know I gotta replace the alternater but could that or the fact that I put a high stall converter along witg my cam be the reason I'm throwing the p0300? The car hasnt lost any power and seems to run completely fine. It feels like their is a small vacuum leak but chexked and came up with nothing. Thanks in advanced