lately my car has been back firing and missing really bad, so far i've replaced the fuel filter, rotar, dist. cap, plugs and wires, air filters, sea foam in gas tank, i replaced the maf sensor a few months ago, and fixed problems i use to have but code stayed on, and still reads code, but i beleive the maf is still good, what else could it be?

 

do you put the wires in the correct order? double check. also is you timming right? check that.

 

Yea check the wire order and the timing.

 

so ive never heard of this, but i replaced the fuel pump cause i was only getting 20 psi on pressure check and now everything is fixed, runs amazing now, ive never heard of a faulty fuel pump causeing back fireing and missing....