454 Tbi sensor???

[osbornl1]

Ok so I had a crazy high idle when I got the truck. Found out a plug on the back of the throttle body was unplugged. Plugged it in idle dropped back down to normal. But it would kinda stumble every now and again at idle. It runs great otherwise Which sensor could be causing this?

Which sensors are which on the throttle body? Where's the map sensor? And what's the thing between the radiator and throttle body that has a little cilinder shaped filter in it?

This is an 89 v3500 with 454 tbi and 4 speed
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