Hi. Recently we had my wifes 2001 civic ex in the shop to have the timing belt changed since it was near the 110k milage mark. We got the car back and shortly after it startedshaking really bad in the 3k to 3.5k rpm range. I stopped this for almost a week and now it's back and doesn't look like it's going away. Is it possible that the car is slipping out of time? a sensor or something? It ran perfect before the maintenance.