what ecu is compatible with a 94 tarus 3.8

ECUs are very engine specific. Even if you run another ECU it will be flashed with another set of specifications for the engine it was made to go with. The baest advice I can give you is to contact www.swapshop.com or it might be www.swapshopracing.com. There are two guys Marl and Brian who know ECUs in and out. If anyone can suggest a re-flash of your own ECU that will work for perormance or if you need it re-built they can help. They also sell used ECUs and can falsh program them with the best set up for your car.