When I first start up the car, something squeals off and on. The serpentine belt was replaced last November. It started to squeal in January. It will stop squealing after awhile. Also, after first turning it on, it will putter. When I try to accelerate, the car has to think about it for a long time. The plugs have been replaced, distributor and cap have been replaced. The check engine light puts out the code for the O2 sensors. Those have been tested and are fine.

Any thoughts? I don't feel safe driving my car because it won't get up and go when I first get it going. Eventually, it acts normal, but it won't keep the RPMs up adequately.