Code 30 means the idle speed control RPM is out of range.
The computer can not keep the idle speed in the correct range.
Could be the control servo, a wiring problem, or something like a vac leak.
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the P0301 means Cylinder 1 Misfire Detected, and the P0303 means Cylinder 3 Misfire Detected. I think have known how to fix the problems after you knew where is the problem.
If your car have motronic 1.3 the most accurate and simple way to find your problem is put the key in the ON position (but do not start it).Then fully press the accelerator and fully release it 5 times.Once you have done this the Check Engine light should blink once and after a short pause start to blink a four digits code. The code language and what it means is explined on this link:http://e30world.com/fuel/BMW-E30-DME-Motronic-fault-codes
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