RedCef

Hi, I am new to this forum. I am an German living in Shenzhen, China. I am sorry for any bad English. I have bought a 1994 Cefi 2 Month back and I have a few problems . The configuration is: RB20DET, Aftermarket Intake, 3 inch split down pipe, Screamer Pipe, no CAT, standart ECU, standart surbo, standart boost. First: I have a lot of movement in the steering wheel at low and at high speed. It shakes quite roughly. Also when I am driving thight corners the steering wheel "gaps", like if the gear of the rod and pinion has a tooth missing and jumps. I can rule out unbalanced rims and tires since they are brand new and right balanced for sure. What do you think? Could it be the rod and pinion? What about the shaking of the steering wheel when going straight? Second: Last time I accelerated quite hard in first gear, suddenly the engine stalled and the car hiccuped for some time, from 1st to third gear. A friend of mine was driving behind me and he said a cloud of black smoke and flames came out of the exahaust. No more hiccups so far but since then when I accelerate the turbo builds up boost and the engine is reeving high, but no power is delivered to the wheels. I can drive but only moderate, means in the range up to 2500 RPM`s. Is my clutch slipping? Or is it the LSD (It`s a viscous LSD) or maybe a problem with the rear axles? Third: The engine is running very rough in idle, around 800 to 1200 RPM. What can I do to solve this?? Any help is much appreciated!!!!