Re: 2.5 power loss
Have you checked the gas tank cap? It should vent and allow air in as the fuel is withdrawn. The canister is likely a vapor holding canister that absorbs(charcoal) fuel vapors and holds them when the truck is parked, and releases them to the intake manifold when the engine is started.
If the EGR was sticking on, as another thought, I would expect it to give a lumpy idle as you got to the stop sign, and maybe cause misfire as you accelerated from a stop. A lack of fuel pressure or flow would tend to cause the engine to 'fall on its face' as you pushed on the accelerator pedal. You'd get hesitation and stumble if you 'over ran' the amount of fuel flowing into the injectors. While going down the highway with the mass/inertia of the vehicle, the slowdown due to lack of fuel would be 'steadier', I think, with just a seeming loss of power. It could be the TPS - throttle position sensor - is not telling the computer that you have stepped on the gas. Most times they'd throw a code as they have 'criss cross' design, I think, with one value increasing and the other decreasing as the throttle moves from idle to WOT. The values should do that to indicate to the computer that one of them is not bogus.
tom
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