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Sounds like maybe the ECU had taken in some water. Is your ECM located behind the engine on the firewall? There are two large fuses located on the passenger side wheel well in the engine bay. They are two large (2" plastic covers) over them.
you have water leaking into the fuse box causing a short cicuit , inspect the fuse box's, inside car and in engine compartment and see which one is getting wet , will look rusty, maybe still have some water left in it etc , then find the leak
same thing happened to me, with a 2003 neon sxt..... but tranny went into error and wouldn't shift out of first til i reset the engine error, tranny and gages were fine (til it got cold). i had to warm the car up, reset the error to go anywhere. i was told it was the drivetrain computer. but i'm still checking other things.
I had a 98 GMC Savana cargo van that did something like that. My speedo would go crazy and the car would want to stall giving it gas. Couldnt get up speed over 20-25 MPH. It ended up being a speed sensor. I'm no machanic but a shop had replaced it and she ran nice after that.