Hello. The problem is when the car is idling, say at a stoplight. The engine idles rough and the volt gage dips and the car almost dies. This occurs several times while the car is not moving. It will dip then recover and so on. I have a check engine light activated as well. I sense a vacuum leak as occasionally I smell exhaust fumes. I had the codes read and it says running lean on bank 1 & bank 2. Thanks for the help!