I had similar problems. When the diagnostic computer said one bank was running lean when hot, I changed the 02 sensor and that took care of the problem. Kinda weird but a couple weeks before that I felt a miss when it was at normal operating temp and I woul dlet it pull past 3500 rpm's. I changed the TFI and then no problems. I would say it is the TFI but since it is saying that one bank is running lean the 02 sensor is what controls that. I would put money on the o2 sensor being the culprit. The TFI module controls the spark-not fuel. the only way for the computer to tell that the left bank is running lean is through the exhaust gases measured by the o2 sensor.
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1988 GT-under construction
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