Whenever my engine gets up to full temperature it begins to foul out as you apply alot of throttle. At low RPMs it doesnt miss a beat unless im accelerating. Usually clears out above 5000 rpm. Its a 1998 Bmw Z3 1.9L, brings up codes for Camshaft Position Sensor, O2 Sensor, and multiple cylinder misfire. Ive replaced the CPS and O2 sensor in the last month, havent reset the codes, but problem persists. Any Suggestions?