2003 Audi A6 Q&A

2003 Audi A6 Question: why is my car idleing up&down after i crank it and cuts off after put into gear

when i crank up my car it starts to idle up&down and soon as i out it into gear it starts to try&kill on me and start shaking a little&then it will die on me.also my check engine light is on and the triangle with the arrow symbol came on can you please tell me what is going on.the problem jus started right after i put cicle k gas in my car i tried to crank it up after 8 hours of filling up. -
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