<TABLE border=0 width="100%" itxtNodeId="632" itxtHarvested="0"><TBODY itxtNodeId="633" itxtHarvested="0"><TR itxtNodeId="635" itxtHarvested="0"><TD vAlign=top width="100%" itxtNodeId="636" itxtHarvested="0">Hey guys -

I have a 2002 F250 with the 5.4, approx 115,000 miles. Truck was running great until this Saturday. Went for a ride and she is running really rough around 1,500 RPMs. There is definitely a loss of power too...very hard to get it over 55 mph. There is a loss of power off the line too. No check engine light. I fueled up on friday and thought maybe I got some bad gas, so I put fuel stabilizer/water evaporator in the tank.

Opened the hood and can't see anything that looks out of place, no hissing or leaking. The idle is just slightly rough.

Any suggestions on where to start???

Thanks!

 

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Prolly got a low grade misfire....might be due to either a bad spark plug or weak COP ( Coil On Plug)

 

Bad COP's and it could also be your catalytic converter. After replacing all my COP's mine still ran like garbage. Cut the cat off it, ran a straight pipe back to the muffler and she runs sweet again.

 

Coil packs, spark plugs. See if that fixes it. Rum it hard and see if your cat turns red from the heat. If the cat is not red it is still good. You also might change your fuel filter on the frame rail. It's cheap and good thing to rule out.