'91 Gtp 3.4 Still Won't Start...help!!!!!

My car died while driving it almost 2 months ago. Fuel pressure ok, fuses ok. I have replaced the battery, stater, coils and module, spark plugs and wires, cranckshaft sensor, knock sensor, TPS sensor, and ECM. The engine turns but won't start. I'm in desperate need of help. Does anybody have C-4????

Have you checked for compression? You may have broken a timing belt or skipped a tooth.

Have you checked for compression? You may have broken a timing belt or skipped a tooth.
Timing belt is not broken and no signs of slipage.

bring us back up to speed as to exactly what happened when it quit (example: it started to lose speed, then chugged, then died etc....) so we can narrow down the possible causes.