Yeah, i would check your grounds, a lot of times on a car its not your ecu thats bad, but a bad ground. I remember when i was in school for automotive we had a vehicle that we actually ran a temp ground wire to the ecu to see if the ground was indeed the problem, and well it worked, the ground was indeed the problem. Check your grounds. You might want to go as far as taking them off one at a time if they look dirty, or rusty to where they may not be grounding right, and clean them up. Atleast then you will know your grounds are ok. Also i would did a check throughout the wiring on the car and make sure you have no corrosion anywhere other then the grounds.
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