MY 1998 Ford Mustang is on the Fritz... Please Help Me Out...? PT. 2?

if the car is acting like it is going to stall, you may want to go get the battery tested. they do it for free at your local auto zone, or advanced autoparts. if your looking to get some more power back into it. you might want to replace the heads, i know that as they get worn over time if you throw a fresh set on there it will feed a lot of power back into the engine.