I have an '84 truck with the EFI 22RE, 5 speed.

I recently bought this truck so I don't have a whole lot of history on it. Supposedly, it has a rebuilt engine with 30K on it. It was running strong just until about a week ago when I added some antifreeze to the radiator and the stumble appeared and it became hard to start when the engine is warm. It starts really well when cold.

I was wondering if there are any Toyota gurus that know the source of this to help cut down the diagnostic time. I am pretty familiar with engines and EFI systems in general.

My suspicions on the warm start problems:
[*]Bad Coolant temp sensor for the EFI

And for the stumble coming off idle:
I am not so sure if it is a bad sensor or maybe something with the ignition?

Any help or suggestions are appreciated