2002 Saturn SC2 wandering idle 800-1200 RPM?

I think the correct idle is @ around 800 but mine will fluctuate up to 1200 at times. I usually notice it when I pull clutch in arriving at a stop light/sign. It'll drop gradually to idle or sometimes jump right back up to 1200. I was told a vacuum leak most likely, so I sprayed starter fluid liberally all over the hose connections behind the engine by the intake and no noticeable change in engine speed. The thing is, when the engine started, it stayed at 800rpm without fluctuations or any problems. I'll try to see if there is a better chance at finding a leak when the car is warmed up, maybe the lines get softer and open up somewhere or something, idk! It's starting to annoy me a lot now, it'll settle down and then start drowning almost and pick up to 1200 and then stay there maybe a little then drop. Sometimes it doesn't go lower than the 1100-1200 at all. It's definitely not normal and it's burning extra fuel and couldn't be good for the engine or a cylinder. Autozone doesn't pull up any codes on it! Before it was a low coolant/engine temp or something, so I changed the water pump and thermostat now there's no code. Could it be related to that somehow? Computer thinking it's still cold or something at times and gives it extra gas? Any input would be much appreciated thanks!