The autos in those cars are garbage. Blinky OD light usually means death.
The cheapest option would be a manual swap. It's documented pretty well at Probetalk.com your question probably is better answered there.
I was big into Probes before I got my Jeep, but I never had an auto so I'm not much help there. Any other questions about the 2.0 or 2.5 I can most likely answer.