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Is the upper intake plenum an factor for misfiring? Or is the lower gasket for vacuum? Maybe the new updated gasket is blown, or upper intake plenum.

Hello, the taped wire is just for protection. Wires are new ones and I want just prevent failures. The screw driver test did I've done. I hear the clicking sound from all fuel injector. I tested all injector and all 6 have exact 14.4 ohm. I think this is perfect. The symptoms was there...

Here one Picture of stock fuel injector by GM: And a aftermarket because one injector was broken after lower intake replacement the plastic is broken when I want replace the lower o rings.

Hi Trav, no OBD II codes stored or pending. I have black injectors with plastic head and foot and metal body. What I forgot the misfires are just on idle and lower rpm.

Hello, sorry for my english. My name is Christopher and I'm from Germany. My wife drives an Chevrolet Lumina with 3.8L V6 from 1998. We have about an month problems with cold starting misfires. Misfire Video 1 I checked all vacuum lines, but they are ok. I found loosen EGR bolts. I ordered...