I have 2006 grand prix gt I put a k&n air intake on, and the car ran fine the first 2 days it was on. I took the car out of town and when I arrived at my destination, tried to put it into reverse and it just dies I tried to restart it and the only way I could get it to restart was to pump the gas after I got it going it was misfiring really bad. My question is why would it be running so well the 2 days I had it on and what would make it misfire 2 days after the installation?