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OK so stop changing parts! You're making it worse for yourself and you may be creating more problems while you waste $$. At this point you could have paid someone to fix it I'm sure. Now you need to take a systematic approach and I'm happy to help you walk through fixing this sucker but you need to follow the directions carefully!Check the electrical connector/connection and related wiring. Check the vacuum hose to the MAP sensor and ensure you have vacuum there/ everything is hooked up. Now do you have a meter or no?
So what is it doing now? Hesitating? Stalling?lack of power? Did any codes come back after you fixed your crossfire? Check your fuel line coming off of the tank and ensure it is not kinked.
STOP CHANGING PARTS!!!!! It's not the fuel pump relay. Did you check for kinked fuel lines or not? By plug are you referring to a fuel pump pulsator? Your truck shouldn't have one. Invest in some tools instead of all of these parts you don't need. Pick up a vacuum gauge and a fuel pressure gauge. If you have pinching pliers pinch off the fuel return hose and see what happens.