Signs and symtoms of a failing ECM/ECU
 

Tried everything on my 400E still starts up fine runs good for 10-15 min then starts to stumble mis and go into limp mode and some times die. Sut it off cool it off and it does it again??? Could it be the computer ??? Everything else has been changed, any help will be appreciated GREATLY
Plugs
Wires
Coils
Fpr
EZL
Temp sensor
Fuel filter and relay
CPS
Fuel pressure tested
Harness
Battery
Starter
Alternator
Had the ETA bench tested and wiring was fine
And some other stuff I'm sure I forgot!!!!
No check engine light

caps/rotors.

Jim

Sorry I new I missed some thing there brand new

generally on GM and Fords it would be the ignition module,or part that controls spark.They get warm and fail.I don't know what controls spark on your car.However you can get a can of Freeze Mist for electronics store,and spray any locations that control spark.It ussally freezes the circut board so contact can be made with defective part.