btracing

i finally got a cel on scanned it with a OBD2 there is 3 codes in it p0440 p0441 p0446. any ideas? thanks in advance. brandon

its all stock... i really don't think it could be a cylinder problem. if it was that i would think it would do it all the time?? i'm thinking its gotta be sensor of some kind but i don't have a cel on. so i really don't know??

I did change the plugs.not sure which cylinder it is as there is no cel or fault codes and it only does it between those rpm?

hi all i have a 2001 is 300 that has developed a miss. the miss only occurs from around 3800 to 4800 rpm but it is a constant miss between those rpm anything lower or higher than that the car runs fine? it has around 103000 miles on it. the cel hasn't came on. any help would be appreciated. thanks.