Vehicle: 1995 F-150, 4.9 Auto, 161,XXX miles. Vehicle accelerates fine (slow but steady!) and holds speed on the flat OK, but when decelerating it tends to chug a little, hesitating, a wound-up rubber-band-like effect... whatever you want to call it. I just put on a new fuel filter and that improved the steady high-speed cruising. Before it wouldn't hold 70mph. Speed would bounce up and down (hesitate, accelerate, etc.). Now it will hold 70 on level roads and will accelerate WOT fine. Steady low speeds, like 25, tend to feel odd though. You're holding the throttle steady and it wants to slow down. You have to give it more gas to keep speed up. Low throttle acceleration also chugs some.
I did a plug/wire/rotor/cap change about a year ago, so it shouldn't need that redone I wouldn't think.... But this sounds a lot like an ignition problem.
Any opinions?
Keith

 

You will need to check fuel pressure and see if the pump is one on his way out. If you did do rotor cap and wires, did you change the position of your distributor?

 

Thanks for the reply. I didn't move the distributor, just changed the parts. I'll have to see if I can find a fuel pressure gauge. I had a homemade one (worked fine), but gave it to the person who bought the car I'd made it for. Ah well.
Keith