I have a 2001 Nissan Centra and it will not stay running. No computer codes, fuel pressure is 40lbs, tried throttle position sensor, no change. Changed fuel pressure regulator and tried new fuel pump. Still no change. Same fuel pressure, hard starting and does not stay running. The check engine light does not come on either. What can be the problem?

. Check all under-dash and under-hood fuses with a test light or multimeter.
. See if AutoZone can test your distributorless ignition coil for free.
. Make sure platinum plugs have no more than 50,000 miles on them.
. Check MAP-Barro Sensor.
. When you turn the ignition switch to ON, do you hear the fuel pump in the gas tank run?