hi, i bought a gti that didnt start from the ignition(it hadnt been started for 2 months before that), then we tried towing it. first nothing happened then 2 cylinders started working and there were bangs into the exhaust and air cleaner(dont know how this part is called in english). my friend who is a bit more familiar with engines(not gtis though) thought the ignition timing was wrong. he also thought that the belt can be loose
can anyone suggest what could be wrong, would really appreciate it