My maxima seems to jitter or shake slightly when I going along and left off the gas...not immediately like you would expect but for example if I'm crusing at 60, left off the gas, then like at 50 the car will jolt or shutter like the tranny slips! I have replicated this at lower speeds, but I'm not sure what it is ! Could it be the car coming out of overdrive? Even at 25MPH?!?