Ok car had a major nitrous back fire June 6th. I fixed all the mech problems with the engine. Now when I try to start the car it cranks and pumps plenty of fuel, just no spark. I though it might be the MSD digital 6+, so I took it out still no spark. New cap and rotor, coil, pick-up coil, plugs and wires. I had the sparck control modual checked at Auto Zone everything is good. As far as SES lights no stored codes, but when I turn the key to the run possition the SES light comes on and does not turn off. The only thing I can find is the prom is bad. As far as me trashing my PROM here is what else I did to the car before the starting problem, I removed the blower, blower box, and the wiring. Is there something in the wiring harness that would make the ECM puke without it?

check the fuse by the battery for the ecm and their is ground wires on that side.and coil power wires to