88 Nissan PU hesitate/stumble

1988 NISSAN HARDBODY
180 MILES • 4 CYL • 4WD • MANUAL
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HAMRNTONG
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88 Nissan Pickup XE, Z24i, 5 spd, 4X4, 180k miles.
Starts ok but with slight hesitate/stumble during idle and at speed. Pronounced smell of exhaust but no smoke. Really struggles to restart as though starved or flooded after short trip to store (1 minute away) before engine is completely warmed up. Restarts aren't as labored after engine is fully hot, but still has slight stumble at all speeds.

Replaced fuel filter, In/Ex coils, vacuum lines, cleaned/gapped plugs.

Aug 11, 2011 at 9:50 AM
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RASMATAZ
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https://www.2carpros.com/articles/engine-hesitates and https://www.2carpros.com/topics/engine-performance/hesitates

Could be one of the following below -check and test:

Oxygen sensors.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard.
Aug 11, 2011 at 11:35 AM