I have a stumble at high rpms.Just before a shift driving and in park reving eng up to 2500rpms.lights flicker almost like amp draw. Fuel pressure 45-50 at idle doest drop much when it stumbles.fuel pressure does jump 45-50 almost hurts your eyes watching it noticed last night the pump tone changes while idling
I dont know what to to its been doing it for a while.When it stumbles itll blow bluish smoke out the pipe

changed filters/cleaned turbo/cleaned egr

have not checked FICM yet will do tomorrow

 

nobody has any comments?

 

sure what year is it?

have you checked the alternator yet for voltage out put. remember you need to wait for the gpcm timer to go off before you do that

 

03 175K

FICM is 50.3 key on 50.7 idle checked with two different meters.Its stock

Turned out to be fuel pressure added the spring and its fixed.

Everyone that hasent added the spring yet needs to