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Wow! That's a lot to have going on. Can you provide the actual codes that were retrieved? It would help me. Many of these things could be related. For example, if the voltage supply is low, it can cause electronic issues. As far as the coolant on the converter, can you see anywhere it could be leaking from? The TPMS isn't going to cause a driveability issue. THe ABS shouldn't cause driveability issues either. I'm not sure, but anytime I have seen vehicles with that excessive amount of power loss, it always seems to be related to a restriction in the exhaust (usually a plugged catalytic converter).
Take a look through this link of symptoms related to a plugged converter.
If you want to check if it the power loss is related to the converter, here is how to test it. It shows the converter being removed. You can simply remove the oxygen sensor before the converter and although it won't be perfect, you should be able to see a small improvement.
Let me know.
Friday, August 2nd, 2019 AT 7:57 PM