96 blazer died !!!!

Hey everyone, how ya doing? Well my 96 s-10 blazer 4.3 died friday, going like 5 mph it just cut off, tryed starting back, and it would turn over but not start up, it would turn over so many times then just stop, and start back again.My chevy dealer said it souded like timing chain jumped, so fixed that and still no go, good fuel pressure and have spark, kinda orange instead of blue, but enough to start im sure cause now its backfiring through intake and exhaust at same time while turning over.Please help!!!!!!!!!!!!!Have checked the timing over and over, and it checks out, is there anything electrical that could cause this thing to do what happened?Just also replaced cam sensor, still no luck.

same kinda thing happened on my 87 blazer. check the coil. mine was wrecked but still made a spark but it would shut off right after it started. i could be totally wrong but just thought id try to help.