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That's not heat. When you first start up the car is in open loop mode. The car is running on the base maps and not using the sensors to adjust the fuel trims. Once the car warms up and goes into closed loop- that sounds like the time when your car is running into problems.
I don't know if you have a small vacuum leak, but lots of times a vacuum leak will idle real bad then run fine. That's because the small leak is relatively bigger to the engine with little air flow (idling) and once the air really starts flowing (driving) that same air leak is relatively smaller.
IMHO throwing parts at a problem like this is 1) expensive and 2) pointless. You don't know what the issue is and you've replaced good parts with questionable parts (just because you bought parts new doesn't mean they are good- they should be tested before installation). You'd be ahead by a lot of money at this point if you went to a good shop that can do proper diagnosis and tell you what the problem actually is.
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