My car continues 2 days no notice, 2 days emission system service required & check engine. Then on the 3rd day the computer goes to normal & with the next drive the check engine goes off. Then 2 days with no messages. I am told if it is the throttle it will affect gas mileage & the power. When I step on the gas a delay. I have not noticed any delay or any change with the driving of the car. If there was a delay I would have noticed. I keep the computer on average mileage always. It is not getting bad gas mileage. The pattern mentioned above has repeated 4 times. Does anyone know what is going on? Could my throttle be getting ready to quit? It is a 99 S-80 T6. We need to keep this car 1 more year. We are americans living in Canada. When we moved here we promised not to sell our car in Canada. We plan to ditch it as soon as possible once transferred back to the states in 1 year. Please help. Sandy