I have a 1998 Toyota Corolla CE with automatic transmission, has 160,000 miles.
I've noticed that for about the past year, it's been having problems accelerating. It's worst during colder weather, which I would expect, but I've tried basic things to try and help and it's still having issues.
What it did last night was basically.. I let it warm up a bit, like I normally do, and got a ways out of my parking lot at work and down the street. It needed to shift gears, but instead of shifting quickly like it does sometimes, it slowed way down and took quite a few seconds of being very slow before it bumped into the next gear, with a noticeable jarring to the car. This has been the worst experience, usually it doesn't slow down quite so much, but it worries me.
So far, I've had both oxygen sensors replaced, the PCM because apparently it was causing issues with the oxygen sensors, and the catalytic converter replaced, as well as using fuel injector additives to my gas to help clean the fuel injectors, because I thought that might be part of the problem. After replacing the o2 sensors, I noticed that it ran better for a short while, but then it eventually went back to what it was doing in the first place. My mechanic told me he cannot figure out what is wrong with it, so I'm wondering if I should get a second opinion with another mechanic, or whether there are other things I could try myself that might help. I've just ordered an owner's manual (unfortunately she didn't come with one) and was going to take a look at that to see if I could find any info, but I also thought I might ask a few opinions as well.
By the way, if you suggest I do something.... and it has something to do with engine parts.. let me know where that part is.... because I'm not so slick on my know how of engines and I'm basically just getting to know cars, period.
~Tania