Could be many things. My first guess would be a vaccume leak.
When a fuel injected car reaches normal operating temperature it goes from what's called "open loop" to "closed loop"
Under "open loop" the car runs on default factory settings. After it reaches operating temperature, if nothing is wrong (as far as it knows), it goes to closed loop operation. While in closed loop operation it uses the data from all the sensors to fine tune engine operation. If you have a faulty sensor reading then the computer will adjust fuel and ignition incorrectly.
Carburetors have a similar function. It's called "choke" It is a butterfly valve that restricts air flow causing the engine to suck in more gas and less air from the carburetor. The result is a richer mixture. When the car warms up, the choke turns off (if working correctly) and if there is a vacuum leak, it will suck in more air and cause the car to run lean and misfire.
If it starts hard too I would suggest a tune-up.
not enough oil in the engine.
yes
An engine driving a propeller or a turbine causes thrust.
There is no such engine as a Cummins 2500 Diesel.
the engine will take longer to get to normal operating temp. and the water temp could fluctuate while driving
Age, carbon deposits, and driving an engine with a misfire.
What causes a car to jerk while driving can be based on many factors. A car can sputter due to engine compression issues, bad transmission, engine misfire, bad spark plugs or even low fuel.
Yellow or "milky" sludge on oil filler cap is caused by short, frequent driving and not allowing engine to reach operating temperature because crankcase vapor, inside engine, isn't being allowed to "boil" off of crankcase and starts to film on engine block. Shutting off engine when it's not at operating temperature will cause it to stick to engine then restarting a cold engine, driving short time will start this all over again. Always allow engine to reach operating temp, it's ok sometimes but not all the time.
It could be the distributor cap. you should check your spark plugs. could be bad or just got wet after washing engine compartment.
when i am driving my toyato 2001 Eaco stops running, it will start back up
The service engine light finally came on and it identified the Mass Air flow sensor is bad.
2 possible obvious faults Ignition timing and\or transmission slip. Hard to say without knowing service history of the engine.