5spdFastMax

After i changed my trani (5spd) and starter (96 to a 97) my car would take a little while to turn over. It would crank but not start so i took out my starter, took it apart, cleaned it and regreased it and then my car started fine for about two days then got worse and worse and now wont start. I also just changed my knock sensor, while it wasnt running. i dont understand it, i drove my into the carage fine and now it wont run. A tech at a Nissan dealership said i had a bad ground from my trani bell housing to engine block but that sounds a little --its aluminum anyways. Anywho, now i got cel code ignition signal circuit, i figure i should check the crankshaft positioning sensors, coils, etc.

Any help would be appreciated