for what reason would i be throwing a missfire code, only at idle

 

Mods?

 

custom tune, k&n cai, 42.5 injectors, 2.85 pully, ngk 1 step colder plugs, theres more mods but those are the only ones i can see causing me to missfire, ive been running this tune for over a month with no problems so i dont think its that, i first thought maybe im running rich at idle but why now, maybe my plugs are set at the wrong gap, there a month old too there set at 35 hundredths, maybe a coil pack?

 

Recheck the plugs, something in the tune i'd say.

 

lets say it is my spark plugs, wouldnt i be getting missfire at high rpms instead of idle?

 

Yea, I think it would be misfiring or studdering during acceleration. Now that I think of it, maybe it is sensing something in the tune and throwing the code without a true misfire.

Get the tune checked.

 

yeah, cause the car runs fine, no stuttering, has a smoothe idle, doesnt jump up and down at idle like it did with the stock tune

 

Is it random cylinder or multiple?

 

I would say the pulgs or the tune. I would pull the plugs out and check them to see how they look.

 

check for vacuum leaks....

 

checked for vacuum leaks, none, im gonna pull the plugs tonight, our plugs are annoying to pull but whatever, i got a friend whos a chevy tech thats gonna do scan with a tech2 to tell me what exactly is goin on

 

I was throwing a misfire code last week. My coil pack went bad, had to get it replaced.

 

well i cant find my t-30 bit so i cant get the spark plug cover off to check the plugs, i got a scan at autozone and im actually throwin 2 codes, P0300(missfire) and P0315(crank sensor), is it possible that my missfire will cause a bad crank sensor reading, or has my crank sensor gone bad and its causing me to missfire?

 

a bad crank sensor will cause misfires.....extended crank...and even a no start situation. I'd take it in and get it looked at