OK, I'M NEW TO THE SITE, AND I NEED SOME ADVICE AS TO WHAT I SHOULD DO. I HAVE AN '02 LS V8 THAT I BOUGHT A YEAR AGO IN MAY. SO I STARTED NOTICING SOME MISFIRES AROUND 45 MPH, YOU KNOW THE USUAL STALLING AND LOSS OF POWER. SO I THEN TAKE IT TO THE DEALERSHIP, AND THEY SAY CAUSE OF MY PROBLEM IS...