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The TFI and distributor are independent, computer is only connected via SPOUT to adjust spark timing based on Load, air/fuel mix
TFI sends computer the timing signal so it can run the injectors based on RPM, but doesn't need the computer to run spark
That's why you can unplug the SPOUT connector and engine still starts and runs
But spark timing does need to be changed based on Load so your lack of power "under load" could be a computer issue
You could leave SPOUT unplugged and go for a drive, should be sluggish when accelerating but OK cruising, and a lack of power
If thats what you have with SPOUT connected then I would say computer is the issue
TFI sends computer the timing signal so it can run the injectors based on RPM, but doesn't need the computer to run spark
That's why you can unplug the SPOUT connector and engine still starts and runs
But spark timing does need to be changed based on Load so your lack of power "under load" could be a computer issue
You could leave SPOUT unplugged and go for a drive, should be sluggish when accelerating but OK cruising, and a lack of power
If thats what you have with SPOUT connected then I would say computer is the issue