my first gsr did this, it was a bad sensor.

 

it will start, just run like crap on 2 cyl it sounds like shooting back smoke cuz of the misses. sounds like i have a 2 step

 

Did you try removing your spark plugs to see what they looked like ?

 

And wich one was that? You do know that their is more then one sensor under the hood right ?

 

well it was in 2001 i dont remember...

 

all carboned up. black.

 

Yep, definitley a fuel problem, or an electronic problem causing a fuel problem. I'm thinking you've got a shot injector, the pressure after turning off the car that is in the lines is filling up and drowning a cylinder... try the old screwdriver to the ear trick on ur injectors and see if all of them appear to be working properly. and if that seems fine and you have an extra injector try swapping out each one with it...G/L

 

i definately agree that the injectors should be checked, however, a single shot injector would explain one carboned up plug, but all four? if they are all that dirty i would lean toward either a bad tune (too much fuel) or more likely, an oil leak. i was under the impression that excess carbon can be caused by leaking valve seals or overly large valve guide gaps, resulting in oil dripping into the combustion chambers... id say pull the intake mani, and check to see if there are signs of oil dripping down from the valves, or do a compression test (with the fuel pump disabled!!) and see if you have bad rings, allowing oil to be burned and creating a lot of carbon build up.

im assuming you are using the correct type of spark plug for your setup.

if anyone disagrees with my assessment of a possible oil prob, please correct me, i am not certain about that. but all the things i described checking are reasonably easy and dont cost anything.

GL again buddy....

 

precision doesn't make 750's, try RC. Precision has 780's

regardless, how did the car operate before turbo. Might also check cap and rotor to see the condition. As those items wear out the spark will not be as good and result in a more rich condition. What plugs are you using and what is the gap? Your are running 10psi,correct?

 

If your ECT sensor is bad it can cause the ecu to dump extra fuel, thus flooding your engine. Causing the misfires. Try swapping it, it is the two wire sensor on the left side of your head.