I have a 93 tb sc and iv had a engine problem for awhile i bout the car for only a few hundred and its supposed to have a rebuilt jasper in it. the car has been idling a little ruff and when im in overdrive at about 1500rpms and give it like half gas to speed up the car will just jerk a few times and be real doggy but sometimes i can just stomp it and the car will go. i have replaced the thermastat, plugs, wires, air fillter, gas filter, pcv vavle it has good oil pressur. the problem seems to be worse when the engine heats up and iv never been able to get the check engine like to come on and stay one it just comes on at sertin times after driving for about half hour. im pretty much out of ideals and if anyone has had this problem or could give me a good ideal about what it could. thanks