[BNtune]

Forgot the EGR. If it is not seating and causing Ex. back into the intake, it will run real rough and should stall. When at idle if you apply vaccum at the valve to open the eng. should stall. The egr valve should hold a vaccum sorce. Pitle on the egr could be stuck open some what . The egr solenoid could be at fault. A bad EGR would cause a lean and dirty eng. Thinking about the spark plugs.