I have a 95 Civic that ran perfectly until one day it just turns but wont start. I have checked EVERYTHING I can think of: Fuel pump OK, ICM is Ok and spark plug fires; PGM-FI main relay is also OK. I have sprayed carburetor cleaner into the intake manifold and crank the engine with open throttle and it almost starts without backfiring meaning timing is good, good spark and there is even some gas smell but nothing ......what am I missing?