Transmission slippage/late shifts, nearly overheating, intermittent miss?

What is your question?

Replaced water pump, heater bypass connectors, changed transmission fluid/filter and engine oil after engine overheated. Still slipping, near overheating and no heat. Noticed miss usually accompanies near overheat and there seems to be no pattern

What makes this problem better or worse?

It's worse after hot

How long has your 2003 Buick Regal had this problem?

transmission slips; close to a year, water pump replaced, fluids changed 1 week or less