Lately the revs on my 156 V6 have started fluctuating when I press the clutch while slowing down (eg when approaching a traffic light). The revs almost drop to 0 and then jump back up to 700-800 and then drop to 0 and then back up ... and so on. Sometimes the car stalls as well when the revs drop. The dealer says that I need to change the throttle body. Before I do that, I'd appreciate any advice from anyone else who has faced this problem.