Even 100 deg. outside temp is cold for an engine.

I would check to see if the cold start injector is spraying and if it was I would put a coolant temp sensor in it and try again.

If that didn't work then its time to take the gloves off (or actualy put the gloves on) these two things are cheep and comen problems and beond that you may just want to get it over with and have it looked at by a shop that knows what to look for and has the info and tools to do a complete diagnosis.