as title says...

When coasting, if I put my foot on the gas, the momentum will make the underbody (somewhere) squeak. Also squeaks every time I shift.

I just wanna know if its something possibly serious and if my car will blow up one day sending me into a guardrail making the pole come through the window through my skull then kabobing me some-how. Having the flames cook me medium rare.

 

Well seeing as your car is nearly 20 years old, theres a very high chance that a bushing or few are worn/torn Best bet is try and pin point where the noise is coming from. Note what road and driving conditions make it squeak or squeak louder.

Once you know the general area that its coming from, then you'll obviously need to jack the car up. And honestly, since the car probably has more than 200k on it, it could be anything. You'll just need to get the car up in the air.