rough idle on T/A

[mtg6486]

ok so i went to island last night and tested my new turbo for the 1st time. i get about 4 passes down the track and after that my car started idleing a little rough. i gave it a rest and retried another run and the 1/4 mile times just started getting horrible. it ran crappy the whole way home and popped a code but it was for one of the oxygen sensors. i feel like it might be a missfire but im not seeing any codes to indicated one. my other thought is a vacume leak but on my first look didnt notice anything out of place. im going to check each plug & wire later today to rule those out but does anyone have any other ideas? the car is a 98 ta with an sts turbo kit running 7 lbs of boost

[NJ Torque]

If its a composite intake... a possible crack on the backside from the boost?

[mtg6486]

i hope not

[1984camaroz28]

How was ur a/f during the run? Pull the plugs see how they look. I whould do a compression and leak down test. Shoot me a pm We can diagnose it for ya if you want.

[camaroAL]

reading the plugs now isnt going to give u any answers, to read a plug the right way u need to shut the car down immediately after u cross the stripe, pull over and rip one out.
also if u think there is a possibility u cracked ur intake, try spraying carb clean around the mani and see if u get any variation in rpm.

[mtg6486]

good idea with the carb cleaner my weekends been way 2 busy so im going to try diagnosing it tomorrow

[1984camaroz28]

the reson to chek the plugs is with a bad tune up he could have melted a plug ive seen it on a few car with not so great tune ups.

[mtg6486]

ok so i did a compression test on all but the back right cylinder on the passenger side and got 178-180 psi on all of them. the spark plugs were kind of nasty i took some pics of them.
im going to chech the valve train next chime in if you got any other ideas
http://www.fquick.com/images/vehicles/full/24814246361.jpg (http://www.fquick.com/garages/viewgallery.php?action=viewimg&id=246361)http://www.fquick.com/images/vehicles/full/24814246362.jpg (http://www.fquick.com/garages/viewgallery.php?action=viewimg&id=246362)http://www.fquick.com/images/vehicles/full/24814246363.jpg (http://www.fquick.com/garages/viewgallery.php?action=viewimg&id=246363)http://www.fquick.com/images/vehicles/full/24814246364.jpg (http://www.fquick.com/garages/viewgallery.php?action=viewimg&id=246364)

[foff667]

What code popped? do you have a scanner that can scan the o2 sensor in question to see what its doing?

[mtg6486]

ive got hp tuners i could take it for a drive and see what that code was that kept poping up

[mtg6486]

ok so it was the back left injector plug

[Mike]

fell off?

[mtg6486]

i was un plugging them to start tearing into the engine and im like wait i didnt unplug that 1 yet so i put them all back on and she fired right up

[Mike]

sweet got lucky on that one..... :)

[mtg6486]

o yea i was like THANK YOU GOD!!!