Car cuts off when you start to drive.
I have a 1999 Oldsmobile Alero and my car was running rough and stalling. Also when the car was shifting, it was making a "thud" sound. My service engine light was on, so I took it to Autozone to run their diagnostic tool. It came back with code P0108 and they advised me to check my vacuum hoses as a possible solution. I looked and found that my air hose running from my throttle body to my map sensor was disconnected. I reconnected the hose and the engine ran normally and didn't make any "thud" sound when shifting. My car is back to normal. So check your hoses. If its still running rough, you may need to replace your map sensor.
Also check he hoses to the map sensor...its a small sensor on the back of the upper intake plenum. Pretty common issue....
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Try starting off in first gear and going to second manually. If that works you need a tranny shop. If not I will have more questions for you.
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