and check fuel pressure, see if you have fuel pressure after your truck has been sitting for a while. when you turn switch to on see if it increases if it doesn't its your fuel pump. if it has good pressure once you turn it on but then it falls after it sits for a while, it means gas is going back from your line into your tank, which is a faulty part on your fuel pump doesn't mean your pump needs to be changed. it can also mean that a fuel injector is bad, best way to find out is the computer that the dealer has it can check every thing every sensor reads for the last 10 drive cycles. after they read the computer info, they can make a pretty accurate diagnosis. I'm not talking about a cheap code reader cuz most of the time that doesn't help diagnosis crap!
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