Cm870

[RDTAZ87]

Hello Everybody, I have a 2005 KW w900 with a de-man cm870 Isx. Its has a brand new overhaul and as soon as I start it up its good for about 30-60 seconds with very good throttle response. After those seconds pass by, throttle pedal seems to be kind of delayed and starts to miss but does not turn off. If I take it for a drive like that it soon misses more and eventually turns off. I turn it back on and no issues for the 30-60 seconds. As soon as I turn the key off again and turn back up i have noticed is good on each start up before the 60 seconds. Do you think its a electrical problem that it resets in each startup then detects a malfunction after the 30-60 seconds?

Ive overhauled it everything is new including mechanical fuel Pump, lift pump, injectors, fuel lines, ifsm is brand new,fuel solenoids, sensors, timing actuators are all new, I can’t thing of what might be wrong. I’ve even changed about 4ecms and was was calibrated 4 different times also. Im sure out of options now. Can somebody please help me figure out this issue?