My 1990 190e 2.6 runs great and has a smooth idle. However sometimes from stop to go it seems that it is hesitating. It does not stall and it only does it for a second. I can go all day without it happening. Also on the highway, it seems to not take gas for a split second at speeds aroung 50mph. The car has about 90k on it. The hesitations have just recently started to happen. It also seems that they happen more frequently with the AC on. I just lost my mechanic and I do not want to get burned taking it to someone new.