On a 1998 Mazda 626 2.0l. I have replaced several items to fix car vibration which was eventually fixed by replacing the gasket in the intake manifold which had a large leak. However, now the engine cranks but will start momentarily after priming with starting fluid. I replaced the fuel pump with no success. Throttle is clean, Air filter is clean and there are no error codes. So far I have replaced the following:

Fuel pressure valve
Fuel pump relay
MAF sensor
Both belts
Crankshaft position sensor
All fuel injectors
Throttle position sensor
Spark plugs
Spark plug cables
Distributor
All motor mounts
Downstream oxygen O2 sensor
Front oxygen O2 sensor
Idle control valve
Fuel filter
Some vacuum hoses
Fuel tank cap-tank is full
Fuel pump