I have a 2007.5 1500 4x4 Gas 5.3l and this thing has been a nightmare..I recently had a reman motor put in about a month ago. Within a week of that I would go out to start the truck and it would start then cut off when it dropped to idle..not start back up for a bit..crank just fine but no start. Eventually It killed the battery and I got a jump and then it started but very rough and you could smell gas. I'm concerned bc other days it wont even give me the initial start. I think its flooded maybe leaking injectors possibly?
Edit to add..this only occurs on very cold mornings after its sat overnught..the rest of the day shes fine.
Things I've already done are:

New fuel pump
New crank sensor.
Cleaned the MAF
New Cam sensor installed at motor swap..
BTW codes thrown are random multiple misfire and all ignition coils..last week it was cyl 8 misfire with ABGH ignition coils...
HELP?
Thanks in advance

 

Put a fuel pressure tester on the rail, and verify that the pressure isn't leaking down. Autozone has a loan-a tool that I have used a couple of times with my own issues. It's pricey to "rent" but you get your money back when you bring the thing back.

You should show 40-55 psi, and it should hold that number for a long time after shutdown.

 

I've been watching it closely by datastream..its good. I'm now leaning toward intake manifold gasket.

 

That is interesting. How does a datastream eliminate a leaking fuel injector?

 

Well your fuel pressure would drop if the pump wasnt priming and engine isnt running..pull the fuse on fuel pump watch datastream closely for a while after shutting truck down..should show constant..leaking it would drop right?

 

Richard, thank you for your response.

What part of the datastream indicators are you looking at?

Can you post a picture or two?

Some testers may offer options that replace other testing methods. In this case, I am curious more than anything to see what has happened to allow you to bypass a mechanical method.