SR Breaking Up, tried and searched

[box240mod]

Problem goes like this.Car ran fine at the track. Trailered home, parked for 2 weeks, trailered to track, bam, won't rev cleanly.

BEFORE.fine no problems.

NOW.Car sometimes takes 3 or 4 tries to start then starts and the car idles fine. Motor will rev fine in neutral up to high rpms but then breaksup in last 1k before redline. In gear, the motor can't make it half way without breakin up. Its not only unable to build boost in gear but it makes a loud popping noise when it breaks up, not just a 'gargle'. Once the car has been revved and hits that 'break up' point, the idle is kinda rough and pulsating. The car also has a 'random' puff of black smoke (running rich) when revving or when idling. And the smell inside the car burns your eyes.

Furthermore, on my last run (drifting) the car began shooting flames when throttle was released, the runs all before that had none of that. Also, I added a 'different' stations gas to the tank mid-day, well before the last run. Mind you that the problems didnt start until the car was parked and then started after a few weeks. Could excessive fuel injector cleaner cause the injectors to go bad?

Things ive done-*replaced plugs*replaced coolant temp sensor*swapped to known 'good' MAF*checked vacuum lines/ ic pipes and couplers

Things ive heard but dont know how to do:*CAS (no clue where or how to test this)*spun bearing (no clue)*fuel injectors (do i just take them out or is fuel gonna leak everywhere?*ECU ? *read about coilpacks causing this possibly?

Boost should be at stock level, what throws me for a loop is that car ran fine, and next start is crap. Nothing was done to change setup inbetween except installing a new seat, heh.
Modified by box240mod at 10:00 AM 2/20/2006

[xero1]

check for codes form ecm

[BaliLover]

Fuel Filter. I've been having alot of problems with mine lately so I pulled my fuel filter, and it had back pressure if you tried to blow through it. I put a new filter in and it stopped breaking up.

[DawgMode]

Aight ur having similiar problem my boy had..the Cas disc inside might be bent..u wanna check that-i dont think bearings is your problem(if it was lol trust me u would kno)-just unplug each injector and see if there is a dip in rpms wen u unplug em

[virus77]

Check for boost leaks with a boost leak tester. If an intercooler coupler is ripped you wont see it by just looking around and you boost gauge wont pick up on it, you need to pressurize the system, this could be why it running bad.

link to tester: zerothread?id=113785