2.9 not running so well

[danger88ranger]

Ok guys, since i got my truck together everytime i start it up it runs fine but within the first minute or so it sputters and runs on 3-4 cylinders. The vacuum gauge drops considerably and stays until its back running to normal. I've recently installed a new air filter, coil pack, and have 8.5mm wires and new NGK plugs on the way from summit racing. Any ideas on this? Thanks

 

[koolmilds]

bad ground to the ECM

 

[danger88ranger]

bad ground to the ECM

Where would that be located sir?

 

[IMenriched]

retrace and double check them all....there is several.

there is one on the back side of the head (PS) that maybe a issue..think'n that it is for the ignition module.

also there is one from the battery down to the frame (also PS) this may continue to the block.

1 over by the coil.
also 1 on the upper intake

take your time look them over very carefully