Having trouble starting my 1988 izusu trooper,checked the computer for codes and nothing appears to be malfunctioning.The trooper runs great once it I started but I am also having troubles at the traffic lights because it idles roughly.I do not have a clue as to the root ofthe problem. Thankyou.








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Hola Amigo,

Here it is, what the Shop manual advice to check
TROOPER
6A–6 ENGINE MECHANICAL
Rough Engine Idling or Engine Stalling
Condition Possible cause Correction
Trouble in fuel injection system Throttle shutting off incomplete / Correct or replace
Throttle position sensor circuit open or shorted / Correct or replace
Fuel injector circuits open or shorted / Correct or replace
Fuel injectors damaged / Replace
Fuel pump relay defective / Replace
Mass Airflow Sensor circuit open or poor connections / Correct or replace
Mass Airflow Sensor defective / Replace
Manifold Absolute Pressure Sensor circuit open or poor connections / Correct or replace
Manifold Absolute Pressure Sensor defective / Replace
Engine Coolant Temperature Sensor circuit open or poor connections / Correct or replace
Engine Coolant Temperature Sensor defective / Replace
Intake Air Temperature sensor circuitopen or poor connections / Correct or replace
Intake Air Temperature sensor defective / Replace
Ion sensing module cable broken or poor connections / Correct or replace
Ion sensing module defective / Replace
Vehicle Speed Sensor circuit open or shorted / Correct or replace
Vehicle Speed Sensor defective / Replace
Trouble in emission control system Powertrain Control Module defective / Replace
Exhaust Gas Recirculation Valve circuit open or poor connections / Correct or replace
Exhaust Gas Recirculation Valve faulty / Replace
Canister purge valve circuit open or poor connections / Correct or replace
Canister purge valve defective / Replace
Evaporative Emission Canister Purge control valve defective / Replace
Valve incorrectly seated / Lap valve
Air Cleaner Filter clogged / Replace filter element
Valve timing incorrect / Readjust
Idle air control valve broken / Replace
Fast idle solenoid defective / Replace
Positive Crankcase Ventilation valve defective or clogged / Replace

Aditionaly you may have to check for any vacum hose loose.

Hope it will help