One reason is that the drag caused by the AC compressor being on is casung a loss of horsepower and thuis reducing the performance of the engine, thus making the engine work harder tomove the car than when the AC is off.
What does it means when car hesitates from time to time
engine is about to stall
Time for a tune-up.
datsons stall when started up
Its broke - get a new car
Your car is not getting enough fuel if it hesitates to take off and shakes. The fuel filter might be plugged or you might have the wrong gas in your tank.
Timing is off.
check the air intake
check for vaccum leaks
your transmissions gone
it does that because it has either jumped time or ....jumped time ! :) :)