Truck wouldn't start yesterday, started today but after a popping sound?

[Weirdoeee]

Yesterday my 2001 Dodge Durango wouldn't start. Today it started with a popping sound, like it backfired but it was coming from the engine! What could be wrong? This would be the first time this has ever happened.

 

[millsym2k]

popping sounds usually indicate valve stuck in open position...remove rocker cover and watch ...or compression test will reveal bank if v8

 

[kelly_f_1999]

is it running alright now or is it still poping guessing it could have been a bad fuel thing if its running now try a bottle of fuel treatment might help if not might be timing