I only get 9 mpg. It smells rich. I have the idle mixture screws turned all the way in. If I back them out it really starts smelling like unburned gas. If I take the passenger side idle mixture screw out completely, the engine runs smooth. no black smoke, lots of power. Like it is finally getting the air it needs. If I put the passenger side screw back in and take out the driver's side idle mixture screw, it stumbles badly.
I am stumped, any ideas? I rebuilt it twice. Do I just leave the passenger side idle mixture screw out? It runs great that way.
Carter BBD no stepper motor, 258ci, inline 6