2002 Marquis.....Hesitation on Acceleration
 

how many miles do you have on the car? What parts were replaced in the tuneup? Are all of the spark wires secured at each end?

I replaced spark plugs , wires, fuel filter. It has 130,000 miles.
I checked wires they are on tight.
Thanks in advance!!!

Hesitaion on acceleration
 

Check the M.A.F. sensor. Probably needs cleaning & do it with M.A.F. cleaner in the spray can & low pressure shop air if you have it. Usually a dirty maf will hesitate when you first hit the gas pedal but as you let off the motor will get after it. Takes a tamper proof torx 20 IIRC. If it's never been messed with the screws will have pooky in the heads that will have to be dug out. If that's the case then it is most likely dirty. You can usually see fuzz on the elements inside the maf tip.