s13 bad idle and black stuff shooting out of exhaust

[SoguRacing]

ok here it goes, i've had this problem from time to time, recently it's worsened to the point that i have to get it fixed. but the question is "get what fixed?". i've taken off/cleaned the aic valve, throttle body, intake manifold, and other stuff. I did the whole seafoam in the gas and through the iacv and still no luck. from what i can tell i have no air/vacuum leaks. the car boosts fine but when cruising it hesitates and when i come to a stop or push in the clutch the car wants to die and sometimes does. any help or theories are welcome thanks!

[downshift_sideways]

MAFS or TPS sensor.

Have you checked em?

[SoguRacing]

yea, i've checked them. i'm not sure if its misfiring/bad coil/ it's become a chronic problem

[powersteeringless180sx]

did you check your timing?

[SoguRacing]

i've checked the timing several times. its at 15 degrees.

[SoguRacing]

would it be a head gasket issue?

[SoguRacing]

i seem to have fixed the problem..the connection was bad to the iacv so i cleaned it and the car seems to be running fine. thanks for the input!

[DJ_Sunrise]

I have the same shit problem dude.. Except my connectors look fine. $300 part ughhh..

-Bart