I recently installed a head on a 91 318is m42, Did the chain guides also. Car was brought to me on trailer. Now with everything together, it will start but not respond to the throttle properly or idle. All air hoses were replaced are seem tight. I can find no obvious air leak. The stomp test says 1215 or airflow meter. Tried another one no difference. The TPS switch seems ok, it has variable resistor as the throttle moves. The funny thing is when I disconnect the tps switch and start the car, it pegs to redline and the key must be turned to stop it. I am at a loss with this. Tomorrow I'll go back over everything again and see if I missed any thing. Any ideas?? The crank and cam sensors must be ok as it starts ok but won't react to the pedal at all, won't hold a steady rpm anywhere.