Q: idle is low and engine light flashes when I drive.

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When I drive my van it has a bad clicking noise and can only drive it 30 mph. The engine light will be on and if it starts flashing I have to slow down until it stops flashing and then I have to drive at least 10 mph below what I was driving for it not to flash. It idles really low and dies. If I try to drive it over 30 mph you can feel it loosing power and about to die. When I stop at a stop sign or when I get home it dies while still in drive. I have not been able to drive it. Hopefully you can give me an idea of where to start looking at.
My car has an automatic transmission.

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