truck will not idle and low power sat up for 2 yr on 1997 Ford F-250

drained tanks added 10 gal fuel and can of seafoam. tuning up this weekend when paid. doesnt like to upshift w/o help from accel pedal.seems to run very rich and rough like a miss until rpm pickup. opening egr valve allows to idle. any help greatly appreciated

Asked by for the 1997 Ford F-250
It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. Start with and don't overlook the basics. If service has been neglected start there. Check compression is even when replacing the spark plugs, check engine intake manifold vacuum is about 21 in HG at idle or it would indicate a problem (perhaps engine mechanical). Verify fuel pressure and delivery is correct, 28 to 45 psi at idle engine running. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
Replace the fuel filter under the left rear of the truck.
appreciate ur help work at expert tire/firestone(both owned by bridgestone)lead tech wanted me 2 tune it and go from there.truck has 54k original miles.sounds like dead miss at idle. going to change cap rotor plugs wires fri. replaced fuel ftr 2day (inlet side rust water, outlet clean)running on front tank bc i can hear pump rear nothing truck is in great shape hope isnt major(351 5.8
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Replace the fuel pump.
Replace the fuel pump from that info really???