I have a 96 chevy 5.7 i have just changed fuel sending unit and pump, brand new dizzy crank and cam shaft sensor new rotor and cap, plugs and wires are realatively new as well, still has a miss and at time will backfire any ideas???

 

I have experienced bad plugs from parts stores,, only get them from a dealer now!

Plug wires on correctly?

Just suggestions.

 

does the check engine light come on??

I would have the PCM scanned for codes - including history codes and go from there....

make sure that #5 and 7 plug wires aren't crossed too.....

 

Thanks, yes everything is on correctly, i thought about the plugs as well i may try that...

 

I would say maybe try the distributor. If you have put a new rotor and cap along with plugs and wires on it, then that is the only other thing that I can think of that could be wrong/making it miss.