How can you verify a suspected timing belt problem?

Greetings, These symptoms you are describing could be a myriad of things. An engine needs three things to run, fuel, air and spark all at the right amounts and the right time. Now the problem is determining which one of those is the source of the problem. The best thing to do is to bring your car to a reputable shop that can perform tests to determine the source of the failure. Kind regards, Stephane Grabina BMW Excluservice 12224 Parklawn Drive Rockville, MD 20852