Well I got two codes from it and on was an O2 sensor (fixed) and one for egr (code 33). I've noticed if I keep it up over 3,000 rpm it runs smooth and has full power with no backfire. When it is running crappy if I rev it slowly it backfires out the intake then when I stab the throttle it cuts out, a little intake backfire and when I let off the gas after stabbing the throttle it backfires out the exhaust. I just don't understand why it does it only if I drive it around 25 mins or so and shut it off and try to start it.
