Remind me, does this vehicle still use a carburetor or does it have fuel injection?
If it's carbureted, the exhaust passage that goes through the intake manifold under the choke spring and carburetor base could be plugged with carbon. This was real common in the 1970s when gas wasn't so clean.
Is the 10 minutes the issue or coming to a stop? If it would run fine for longer periods at highway speed, you might check for an EGR valve stuck open. You won't notice the valve opening at highway speeds, but it should never open when you're idling. A chip of carbon can hold the valve open, or carbon buildup on the shaft of the valve could prevent it from closing. If this is the problem, holding the gas pedal down a little will prevent the engine from stalling but it will still have a rough idle.
Most likely the oil waning light isn't a clue to the problem, just a result of low engine speed.
If you have fuel injection, was the battery recently disconnected or run dead? If it was, you will need to relearn "minimum throttle" before the engine computer will know when it must be in control of idle speed. The engine will stall until that is done unless you hold the gas pedal down 1/8" but this doesn't cause a rough running engine. Simply drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the brake or gas pedals.
Tuesday, February 9th, 2010 AT 11:29 PM