Sometimes in 1st or 2nd gear in heavy acceleration it seems that the car won't accelerate properly and staggers. The only way I could describe it is that it seems like something is clogged and not making everything flow properly to accelerate efficently. It actually makes the car jolt like I am pressing and releasing the gas pedal. Anyone experienced this and know what it could be? I have about 34000 miles on it and get it serviced reguarely .