I have a 2001 grand prix GTP with 98,000 miles. It recently has developed a few problems. When I am driving at normal speeds and kick it down to pass someone it is very hesitant. It sputters and just doesn't seem to have any more power. Sometime the SES light will come on for just a few seconds until it stops sputtering. Any idea what may be causing this. It seems to happen around 4-5k rpm. Also my anti-lock brake and my traction control light is on all of the time now. I have checked all of the whire connections going to the wheels and they look fine. When I was checking the passanger side front tire I notice a "glob" of grease under the large rubber boot and it looks like it has gotten into the serpentine belt and slung it on the underside of the hood and along the firewall. What is happening to my car?