i have an 05 bonneville gxp with the northstar. its just passed 158xxx mikes and on a cold start, it hesitates, misfires, and the throttle will start revving all by itself. after it has warmed up, everything goes away and it runs perfectly. i already checked out the MAF and it seems to be good. ive been doin forum research and the most im getting out of it is a vacuum leak some where.. im getting codes P0171, P0174, P0300, and P0455. P0455 im not too worried about thats just the gas cap seal. any help or opinions will be appreciated!! thanks everyone