In general what happens to the atomic mass in each period?

1994 nissan pathfinder will start but then turn die when goes into gear. only happens in morning?

• iv replaced my 02 sensor, my mass air flow, fuel and air filter. only happens in morning or after it has been sitting long period of time. but once it starts to go it works great. the only way to keep it going in the moring is to press the gas while i put it into drive, it will chug at 1st then start to go normally. its 2wd auto. xe

• Answer:

  Check the engine and intake air temperature sensors with an ohmmeter. But also check in the dark for arcing spark plug wires. Use dialectric paste on both ends of the spark plug wires. Reduce the plug gap to about .030" and it will run better when cold. Let it warm up more, because it is hard on an automatic to rev while sifting. If it takes too long to warm up, use a block heater or change the thermostat. Check fuel pressure with a gauge, a weak pump will run lean. Check for any manifold leak, like loose vacuum hose, leaking PCV, EGR, or purge valves.