99 SC2 Chugging issue
 

Hi,
We have a 1999 Saturn SC2-2door. Yesterday as we were going to the store the car began chugging as if it was trying to shift back and forth between 2nd and 3rd gears. We were going about 30-35 mph.

We went to the store and when we left it didn't do it for the rest of the day. I took it out on the highway where it also ran fine. It was cool outside, around 45 degrees.

Today it did it again. It My GF's words "the car did that thing again when I first left the house. Then when I got on the highway I noticed the temperature went to the midway point when normally it only goes to the 1/4th point and stays there. After that it went back down and was fine for the rest of the trip."

Any ideas? The outside temp was fairly low, about the same.

Thanks in a advance for any help!