94 7.4L no spark

[banffboating]

Help I was driving and all of a sudden lost power and back firing but would idil fine just no power got a code low voltage fuel relay changed out fuel pump
truck ran fine two weeks then did the same thing I was far from home went to a parts store got a new ecm and fuel pump relay but this time lost spark from coil ! will not start

[maxwedge]

Welcome to AF. TBI, I assume. Got 12v to coil, correct? Suspect module or pick up in dist.

[banffboating]

I replaced the module now it runs but back firing from carb at higher rpm and seems to be missing the distrbuter shaft has no play in it!

[maxwedge]

Fouled plugs, cracked cap, switched wires, bad coil or wires, are some possibilities.