Car spits and sputters under 2500 RPMs

Do you have any codes or have you checked for codes?Also have you checked the coolant temp sensor?

They very well could be coated in oil also on that car inspect the coil towers they get corroded very often. Let me know what you find.

Which coolant temp sensor did you change top or bottom one?With the code 32 its egr code most likely a sticking egr valve causing a large vacuum leak at lower rpms causing your problem. Remove the egr and see if its stuck open if it isnt then push the egr pintle down till it bottom out and see if it sticks open. If it does then you will have to replace the valve I havent had much cleaning them you can try if you want. Let me know what you find.

More then likely you have a sticking egr valve that is the number 1 cause of a code 32 on that car. Also a sticking egr valve will cause the symptoms you have. If it was my car thats where I would start.I have replaced a lot of egr valves for that code and those symptoms. They can stick intermintantly also try this next time it idles high and is acting up take a soft face hammer or a screwdriver with a large handle try tapping on it see if it runs normal. But I would say you have a sticking egr valve from the code and the symptoms.