There are dozens of things that turn this light on. G0 to auto zone and have the codes read for free.
Either the emergency brake is on or the brake fluid level is LOW in the brake master cylinder in your engine compartment
timing belt
An engine cylinder misfire has been detected
i had a similair problem its actually the motor mount has been broken or the rubber grommets holding the exhaust in place are getting worn down and need to be replaced!!
1995 Mystique automatic 4 cylinder probably has a Ford CD4E transmission with an internal filter that cannot be changed without a major disassembly of the trans. which makes it impractical if not impossible for a home mechanic or fast lube shop to do. Either get your transmission rebuilt or replaced while you have it out and save yourself some grief.
it could be your coil pack or a short
For obvious reasons between makes and models, this varies.
Sounds like you blew a cylinder in the engine.
Go to AutoZone and ask one of the fellas to come out and "check your check engine light code". They will be able to tell you what the problem code is, as well as re-set your check engine light.
Mercury was a division of Ford
The medical answer is that you risk your life with Hg (mercury) poisoning. It feels not as cool as water; it makes your hand feel light (buoyancy). Although how I know that, I won't tell.
You don't hit it, but when you light it it makes a " squeaky pop" or " whooping" sound.