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First check for any cracked pipes leading into the intake manifold If all OK (with no codes showing it probably is OK) try checking the fuel pressure regulator. If you smell fuel from the pressure regulator vacuum side arm (when the vacuum line has been disconnected) it needs to be replaced.
4.9 litre ?? you having a laugh its a 10ton truck engine not a pick up -global warming machine,remove the pump/sender unit and check the gauze filter also look inside tank for a something floating around ,i think the idles is not a related problem to the vehicle losing power but their is a possibility you could have a problem with the little vac operated thing on the fuel injector line that allows the fuel through only when the engine is running
Any check engine light or codes? My first thought would be tps or possibly fuel filter. As car builds up pressure a clogged filter would cause your symptom.
Have you put a pressure gauge on and then drive to see if pressure drops. If it does it is likely the pump. Sometimes these problems lead to it being the computer.
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