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Hi! I have a 96 GMC Sierra with a 5.7 engine. It will crank but will not actually start. It makes a weird back firing sound. My fiance has replaced the crank shaft position censor, fuel filter, spark plugs. It had a new fuel pump put in about a year ago. We are able to hear it running when trying to start. The spark plugs do have gasoline on them. And we do have spark from them. I need help please as neither of us are mechanics and I'm not sure what else to try. Any advice would be greatly appreciated :)
 

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Sounds like the timing is off
 
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