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I was having the IAC code (along with a no start) come up for my 93 regina. I thought my IAC was bad but it was not. I have never heard of IAC going bad on these cars. It turned out to be the fuel pump. I would replace that if it is the original as they last about 100K miles, especially if you are traveling long distance.
As far was your battery drain, once the key if out, only the interior lights and clock are energized. Check the lights, i am not sure but you may have an engine bay engine light or a rear trunk light. Check these, they have sensor for turning on and off, I think it used to be mercury if I recall.
I would also suspect sticky relays. I think you mentioned the Fuel pump relay was replaced. Check for juice on the fuel pump with the car off?
Also also, has the alternator been replaced?
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