ya i have a 91 tb sc i replaced the engine with a 89sc and it will start but idles a little ruff and when u go to drive it and put on the gass a little u can just watch the rpms fall and it just about dies. i took it out on the back road to test drive it and made it home goin about 15 mph it just dosent have power im pretty sure theres no vacume leakes all the senors and plugs are hooked up right, i repalced the ignition modualr, i got a computer scaner but havnt quite figured out how to read it yet and i cant always get it to throw a code unless i drive it bout 15 to 20 mins . can anybody give me a ideal about what it would be it would mean alot to me. this car has been sittin for a good 6 months or so and iv been dieing to get it running again and when i finnally did i cant even get runing good enough to drive. well thank you for any suggestions.