I own a 1988 Range rover with 3.5 litre v8 with lucas throttle body . My mechanic recently tempered with the throttle position sensor and throttle body settings without having proper knowledge of these things, and has in the process probably screwed up the air fuel mixture as the car is now running rich and giving out black smoke. Is there any proper way for adjusting and setting the TPS and throttle body settings to original specs. I live in Karachi, Pakistan and hense there are no Range Rover dealers and probably only 10 or 12 range rovers in the entire country. Please help.