Stalling after vehicle is warmed up

it sometimes stalls when decelerating. Here are a few possible causes for these issues:

1. Vacuum leak: Check for any vacuum leaks in the engine. A leaking vacuum hose or intake manifold gasket can cause a rough idle and stalling. Inspect all vacuum hoses and fittings, and consider using a smoke machine to help identify any leaks.

2. Idle Air Control (IAC) valve: The IAC valve controls the amount of air entering the engine during idle. If it becomes dirty or faulty, it can cause a rough idle. Try cleaning the IAC valve with an appropriate cleaner or consider replacing it if necessary.

3. Fuel system issues: A clogged fuel filter or a malfunctioning fuel pump can lead to insufficient fuel delivery at idle, causing rough idling and stalling. Consider inspecting and replacing the fuel filter if necessary. It may also be worth checking the fuel pressure to ensure it is within the manufacturer's specifications.

4. Mass Air Flow (MAF)

It sounds like there are multiple issues with your Isuzu KB 240 LE. A powerless engine and stalling can be caused by a number of issues, including:

1. Fuel Delivery: If the fuel pump is not delivering enough fuel to the engine, it can cause a loss of power and stalling.
2. Ignition System: If the spark plugs or ignition coils are not functioning properly, it can cause a loss of power and stalling.
3. Mass Air Flow Sensor: A faulty mass air flow sensor can cause the engine to run lean, resulting in a loss of power and stalling.
4. Vacuum Leaks: A vacuum leak can cause a loss of power and stalling.
5. Throttle Body: A dirty or clogged throttle body can cause a loss of power and stalling.
6. Engine Control Module: A malfunctioning engine control module can cause the engine to lose power and stall.
7. Fuel Injection System: A clogged fuel injector or a failing fuel pressure regulator can cause the engine to lose power and stall.

It's recommended to have the vehicle professionally diagnosed to determine the root cause of the problem. The diagnostic process may involve checking the fuel and ignition systems, performing a vacuum leak test, checking the throttle body, and possibly scanning the engine control module for codes. Once the issue is identified, the necessary repairs can be made to restore proper engine performance.

Have you replaced fuel filter ? Sometimes with time, dirt collects inside fuel tank and clogs the filter which may cause your vehicle to shot off.
Also check for any codes which may be present and causing your problem

any engine codes if so have the vehicle for engine code --your problems can be from a numerous of reasons--check fuel pressure filter can be clogged or partial clog --vacuum leak check hoses --throttle body may need recleaning or sensor going -- egr valve carboned up ,damaged or circuit problem inspect it if carbon clean valve or replace if broke --bad load of fuel --needs tune up -air filter clogged

Have u checked the cadeletic converter. It can do funny things

Check the steel fuel line under the intake manifold
had one that was almost completely clogged shut with ****
took a month of hunting but found this to be the problem

check for any vacuum leaks , thats what normally causes stalling at idle or low speeds

sounds elecrical try some eletronic parts cleaner and spray all the connections maybe the is a [wet] sensor which is hard to trace

I've had this problem on vehicles with 70k or more miles on them. Symptoms include rough or uneven idle and dying. OBDII showes no codes.

Bad fuel, vacuum leak, low fuel pressure, carbon build up, inoperable fuel tank ventilation, poor grounding, low voltage, intermittent relay contacts are possibilities.

The simplest and mostly likely problem is:
Carbon build up inside the butterfly. With the engine off, pull the intake off. Use injector cleaner and a shop rag to clean the intake throat where the butterfly is. Use a plastic or wood handle to hold the butterfly open to get both sides cleaned. If this doesn't clear the problem, check for vacuum leaks, loose hoses etc.

Check fuel pressure and replace the fuel filter if it's low.