Weird Idle Question...

[CupCate18]

So I have noticed sometimes when I already have the engine warmed up and I turn it off to go in the gas station, or anything for a few minutes and come back out to start the car, it starts fine, but has a weird idle on occasion. It sounds like it bogs down really low, but once I get out of the parking lot and give it some gas, it smooths out. Any clue what I should have looked at? Could the plugs and wires need replaced? Sometimes when I am at a red light, it will have a little difference in the idle (typically my riders don't notice it, but I do) where it will go up and down a tiny bit.

Any help is greatly appreciated. She's a '96 with almost 90k miles on her.

[Roadster]

Is the AC compressor on by any chance? Lol, sounds obvious but it kind of fits the bill.

[CupCate18]

Not usually. It has more of an obvious change with the heat on, but it still does it with everything off as well, just not as bad.

[Roadster]

The cooling fans kicking on will cause a slight idle fluctuation. Otherwise, I dunno. Hopefully someone with another theory will chime in.

[Pitt]

I've noticed the same situation with mine...I've also noticed it does it whenever something is swithed on like lights, wipers, etc. My personal belief is mazda didn't put a good enough electrical system together to handle all the gadgets running the engine...or it could just be the idle air control valve.