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Backfiring from intake usually indicates a timing problem. The brake job has not effect on the engine, unless you accidentally disconnected some wires in the engine compartment, but highly unlikely. More likely the timing belt/chain may have jumped a few teeth. If you have an access hole to see the timing belt and marks have a look. If you need more specific info most libraries have subscriptions to online automotive service manuals for almost any year, make and model of car, motorcycle, or whatever. If you have a library card, some will give you the u/n and p/w so you can access them from your home computer, if not then you will have to go to your local branch to get access, but it is free!
Sounds like the problem is no spark to plugs. check for spark to and from coils. also the wires and spark plugs. It needs spark and fuel to start. If check engine light is on, Its a possibility that its a bad cam sensor. Check above first! If light is on you can go to any auto parts store so they can read the codes, with a scanner for free. and tell you the problem area. Good-Day!
How long since a tune-up? Any applicable trouble codes? The basics if it cranks good but won't start, have a helper crank it while you check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure. Also, check fuel injector pulse.
Crank the starter intermittently so it doesn't overheat. You need spark--fuel--compression, proper amounts at proper time, where applicable, or it won't start.
You don't say how old the truck is - or how old the pump is - most likely it is the pump 'dying' as you try it -
I would look near the tank and find the ground wire -[ it may be on top of the tank] - the most common fix is the fuel pump and sadly it sounds like this is it --
Also - Take down the Vin # and call the local dealer - - ask about recalls and Service bulletins.
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