My 2001 GLS seems to be having trouble with accelerating. The first problem occurs only in the mornings, or after I leave my car sitting in a parking lot for an extended period of time. It starts up fine, but when I put it in drive and press the gas, I get nothing. The RPMs go down, and it seems like it's trying hard to keep the engine running. After a couple of seconds the car will start to accelerate suddenly and RPMs will go back to normal. This has been happening for quite awhile-- the problem occurs on and off, not every single day, but has been happening for at least 3 months.
The second problem is just general accelerating, expecially on the highway. Normal road driving accel is fine, but getting up to highway speed (60 or 65), or accelerating while traveling at highway speed (60) usually requires pushing the pedal to the floor. While going about 60 on the highway, I press the gas to speed up and it usually has to downshift a couple times to get anywhere. I almost never use air conditioning in my car, so that's not slowing it down. Last time I used the AC though, I was so frustrated with the lack of pickup that I had to shut it off and put up with the heat. This problem I've noticed since about the 1st of the month.