So it was my daily driver and I bought a 89 c1500 and drove it for a week then went back to start the blazer and it was hard to start. It only hard to start in the mornings in the afternoons it starts right up. It would spit and sputter shift in between first and second and second and third. And when I hit overdrive lock up it would spit and sputter then I would lose lock up. but it’s been gradually getting worse to the point now it only backfires even when I use ether. If it does fires off it sounds low and boggy then nothing Only code it was thrown was for the crank sensor and I changed it. I have done this to it already

crank sensor
plugs
wires
cap and rotor
good fuel pressure
good spark
good fuel
fresh oil and filter
battery
I thought maybe the timing got off but sometimes it will fire up like nothing is wrong and the next day nothing I’m not sure
Any help is greatly appreciated in advance

 

This is in the wrong subforum hence the no replies, but i'll make an attempt to help

Are you getting voltage to the crank sensor
are all of your grounds good?
Inspected wiring harnesses?
you've thrown the parts canon at it, now its time to diagnose it.