pull the spark plugs, check their color, bring new plugs just in case the plugs soaked with oil. It sounds like an oil burner... if you are lucky it could be the valve guides and seals..
In older cars, moslty with V-8's the oil return hole could get clogged (if the oil holes were too small) and if the oil wasn't changed regularly. But, if the oil is not returning down the return holes and the guides and seals are shot the oil wil foul the plugs..
But, like I said, that was with certain engines in the old days,, most like you jus thave an oil burner.. but you may get lucky...
You PVC Valve maybe bad or a cracked hose... bring duck tape, in case a hose is broke or cracked, that would defintely cause the engine to hardly run and stall.
