2006 Bmw X3 - Needs Work

The body on this car is immaculate and it has a nice matched set of Continental tires. The seats are leather that are showing their wear but have no rips or tears. There is no headliner because the sunroof had leaked (now repaired) and severely damaged it. One can get another headliner at a salvage yard. I put in a new radiator, hoses, PCV system, spark plugs, 2 oxygen sensors, and some other smaller mechanical sensors. The current problem is that was running fine until it quit. It starts, runs ...