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Q: why the truck stop sometimes while driving on 2001 Isuzu Rodeo Sport

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
and not only that the radiator fan always working constantly
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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The fan staying on could be a sign of actual overheating, low in coolant or a bad cooling fan control switch. The drivability problem could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. An engine needs fuel, spark and mechanical integrity to run. Fuel pressure and volume is easy to check (even "opening" a fuel line while someone cranks the engine over will verify the presence of fuel but won't verify pressure). Ignition spark is easy to verify, and after that plugging in a scan tool to the 16 pin diagnostic socket under the dash can verify the operation of a lots of key engine sensors without having to do intrusive testing at each sensor. Many sensors on the engine are shared by both the ignition and fuel system, failure of any of these may cause an engine to stop running. You would need to see if you ae loosing spark or fuel when the engine stalls.
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