I have an LO3 and it usually runs great, but there are times when the car has been sitting for a while and when I go to start the car (and the engine is still warm) it idles pretty rough. When I give it gas, it sputters and bogs down and after about 20-30 seconds of driving like this, it finally hits high RPMs and everything smoothes out and idles fine and drives completely normal after this. The car ONLY does this when the engine is warm and the temperature outside is in the 90's, and it never lasts more than 30 seconds or so. It doesn't throw any codes either. I know it couldn't be the O2 sensor and I don't think it's the fuel pump, so could it be the TPS? Any help would be greatly appreciated!

 

Perhaps a bad MAT sensor?

 

Did more searching and still not sure, does anybody have any answers?