I have a 1998 ford expedition with a 5.4l engine. It hesitates alot?

It will rev up but has no power and knocks alot. It feels like it want to go but it won't. The muffler gurgles. What can it be. I changed the sparkplugs yesterday and its worse.

Get a new car it's dying on you.

Two of the the most neglected parts of a ford system for some reason are the distributor cap and the fuel filter. Both of these cause hesitations in the V-8 engines. If you don't find it there look at a new set of wires

Disconnect the mass airflow sensor and re-check, it may be dirty and giving bad readings to the pcm

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