Engine Performance problem
1993 4 cyl Two Wheel Drive Automatic 240K miles
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I changed fuel pump relay , got gas at rail, changed crank pos sensor, fires will not stay running sounds rough like its not running on all four. before it would not start at all untill i changed the crank pos sensor. help !!!!!!!!!!!!

HAve you checked for spark at each cylinder?

have spark at all but I get it to start and it seems it not running on all 4 and stalls out unless I push the gas pedal in and runs rough

IF spark is good, then check and make sure fuel pressure is in spec.

Check timing and check compression.