Car is hesitating and jumpy

When I press on gas petal the car hesitates and seems like it is having trouble accelerating. It also does this when I accelerate up a hill actually it is worse. The mechanic changed by spark plugs and coil pack and it is still doing it. What could be the problem.

When was the last time that the fuel filter was changed on your mystery vehicle?

If you give us details on the make, model, model year, and odometer mileage of the vehicle, we may be able to be more helpful.

Did your mechanic check the fuel pressure?

Thanks, sorry about the mystery. It is a 2007 Chevy Impala and it has 69,744 miles.

I will ask about the fuel pressure. Thanks