What sensors will cause engine idle to fluxuate

sure can. it helps adjust air fuel mixture for proper burn.

Throttle position, and or mad air flow sensor. Little pricy but those two sensors control your fuel air mixture causing those issues.

hi,
-please clean the throttle manifold,
- replace idle air control
- check the tps
-check MAP sensor if feeted.

easy ..........throttle postioning sensor ,or your throttle is sticking meaning your throttle cable isnt moving in an out properly

No, a idle sensor is an electrically-operated valve which allows air to bypass the throttle plate in a fuel injected engine to regulate idle speed. The throttle body sensor is used to monitor the position of throttle in internal combustion engine.-----------------------------------------------------------------------
godiag key programmer

I'm assuming you mean a coolant temp sensor. The sensor tells the computer what the coolant temp is.
Normally when a sensor fails the check engine light comes on to warn the driver. Normally but not always.
One thing that could affect both problems you describe is the idle air control valve. If the valve fails or sticks, the engine can stall or have a high idle speed. The computer controls idle speed by how much air is allowed into the throttle body.
The throttle body could also be very dirty.

replace the throttle position sensor when this sensor fails the idle speed fluxuates may cause the trans to shift oddly also

I just got one today with the same problem; both lights and code p1290 hard to start and once started stayed at idle with no accelleration . If you have already fixed it would be nice to share the info. If not already done ill tell you when i fix this one.

It is most likely the EGR (Exhaust Gas Recirculation) valve.
The valve is supposed to close when the car is idling and open other wise.

Inspect it / Replace it.

Hope this helps!

Most likely your throttle position sensor is faulty. You could have a vacuum leak as well. Most probable cause is a bad sensor. Is your check engine light on? Have you checked your engine codes? You can go to autozone.com and register for full free online repair manual.