Gilera GP 800 i.e. - Engine Does Not Rev down; Engine Stops at Idle

Engine stops at idle
ENGINE DOES NOT HOLD IDLING/ IDLING IS UNSTABLE/ IDLING TOO LOW
Possible Cause Operation
Presence of faults detected by the self diagnosis Pump relay
HV coil
Injector
revolution timing sensor
Air temperature
Coolant temperature
Ignition efficiency Spark plug
Ignition timing
Correctness of the parameters Throttle valve position sensor
Stepper
Coolant temperature sensor
Intake air temperature sensor
Intake system cleaning Air filter
Diffuser and throttle valve
Additional air pipe and Stepper
Intake system sealing (infiltrations) Intake manifold - head
Throttle body - manifold
Intake sleeve
Filter box
Fuel feed (low pressure) Fuel pump
Pressure regulator
Fuel filter
Injector capacity
Engine does not rev down
ENGINE DOES NOT RETURN TO THE IDLING SPEED/IDLING SPEED TOO HIGH
Possible Cause Operation
Presence of faults detected by the self diagnosis Pump relay
HV coil
Injector
revolution timing sensor
Air temperature
Coolant temperature
Ignition efficiency Ignition timing
Correctness of the parameters Throttle valve position sensor
Stepper
Coolant temperature sensor
Intake air temperature sensor
Intake system sealing (infiltrations) Intake manifold - head
Throttle body - manifold
Intake sleeve
Filter box
Fuel feed (low pressure) Fuel pump
Pressure regulator
Fuel filter
Injector capacity
GP 800 i.e. Injection
INJEC - 9