I have an 05 magnum. Original issue according to computer read was an O2 sensor. Runs choppy & rich when starting. Engine light blinks for 5 minutes, the beeps, goes solid light, then drives great. Always does on a cold start. I have had 2 O2 sensors replaced, a tune up, an oil change. Oil was filthy, and a fuel cleaning. Now the computer just says misfire, still doing the same thing. And the mechanic says its a cracked intake. My question is, if it was a cracked intake. Wouldn’t it run badly all the time? And also they do not want to look at the cam sensor. My brothers dodge truck had that issue. Seemed to fix it.