Hey guys I have an 07 chrysler 300 touring 3.5l. Some weeks ago I got a p0306 misfire code so I had replaced the spark plugs, coil pack and the injector for cylinder 6. The car ran well for a few days then I got the check engine, throttle control warning light and the traction light on. The cars idle is very rough and it stalls out at times as well as now the brake pedal is very hard and the car has a hard time stopping. I scanned the car and I got the codes p0174, p2111, p2638 and a c121c. I don't know what else to do, anyone have any ideas?

 

What is the condition of your battery and alternator? A low voltage condition will cause all sorts of weirdness and unrelated codes with the computers.

When you scanned the codes, were any of the emission monitors 'not ready'? I have seen a failing alternator produce an ac (alternating current) ripple that would reset the emission monitors (as well as other weirdness and blinking instrument cluster lamps).