Engine management light on ,car still runs perfect

Engine coolant temperature sensor reading too cool causing rich mixture or oxygen sensor reading lean causing a rich fuel pulse . Oxygen sensors come into play as engine warms up and goes into closed loop .

Engine light is flashing,any codes.

I have a 1997 ford E 150 customize mark 3 van have driven back and forth to work 5 years ran great Christmas Day drove down to the garage and back up to house and now it will not start turns over has spark will not fire

Check fuel pressure and volume possible bad fuel filter (not enough fuel volume for hard acceleration)

If you feel the engine missfire on acceleration, you could have a weak spark plug and/or plug wire. If you have not replaced them in over 30,000 miles I would start there.

I have a same problem. need help

Misfire, From a cold engine you wont have the misfire. When you engine is cold fuel is in demand and it will run great. As it warms up the fuel strategy is to lean it out (proper balance is 14.1 to 1) . At normal operating temperature the spark plug required KV is 15kv. As you accelerate the sparkplug require more voltage from its coil reserve and it delivers and at the same time the engine demads are high in order to accelerate and the spark will seek the easiest path spark plug, now when you come to a stop the demands for spark decrease and it seek the easiest path where is that at ? out through the boot of the spark plug, The vehicle is equipt with what they call COP (coil on plug) along the boot path it deteriates and so does the coil it deteriates .170,000 mile of hard working COP. they are at their worn stage you can find the weak coil with a cop tool because it misfire on acceration your looking at a boot,probable water got in there shorting it out,if it misses at idle its either water in the boot or the boot itself or the cop.

engine lights also report on transmission faults which you experienced
have the fault codes read at an accredited auto transmission shop for a proper diagnosis and quote

ur having fuel supply or poor electrical supply problem thats why the engine cuts off underload/ check spark plugs or airflow meter condition as well....

swng,
1) Is the service engine soon light ever on when engine is running?
2) Per your description I would look at the ECT sending unit. It sends coolant temperature information the the Engine Control Module for proper fuel delivery for cold engine start. It may have lost its calibration.
Let me know.
Regards,