Make sure the battery is ok, but I would refrain from 'jumping' any car with as much electronics as these cars have. Also if you swapped the coil, make sure it has a good ground. These cars are well known for having ground problems even with the engine and trans bolted down. So I would start at the cheap items, and work my way toward the expensive stuff. Don't overlook the simple stuff, it sucks to find out it was a bad fuse after blowing a grand on diagnosis work.