First off lets start with the first problem. i few weeks ago my truck had trouble starting but eventually would start. went on for about a week and a half and i thought it was just because it had gotten cold. then one night i had a backfire that caused my muffler to explode and is now open like a steamed clam. it started fine after that and i went home. now it will just crank crank crank turn over once... maybe twice.... then back to crank. although since this started i have been able to get it to start again and it ran fine i drove it no problem got it back in the driveway turned it off and tried again to start it. wouldnt start again and im back where i started with the crank kinda turn but nothing.