1998 Mitsubishi Eclipse No power

Have you checked if the battery is dead? Use a test light or voltmeter, or try a jump-start from another car.

If the battery is charged, follow the smaller positive wire to the under-hood fuse box. Be sure that connection is clean and tight. Follow the smaller negative wire to the body and be sure that is tight and not rusty.

Don't overlook a loose or corroded battery cable clamp.

That's a totally different symptom than you described earlier. I'm a cranking system expert. Engine performance, ... Ahh, ... Not so much. To get you started, have you checked for spark and fuel pressure? Is the Check Engine light on, and / or have you tried to read any diagnostic fault codes? Does the engine sound normal when it's cranking? A jumped timing belt can make it spin faster than normal.