come to think of it, i have that same rattle wontgrowup, when i mash the gas and it revs up. really annoying, the only fix i have found is the volume on my stereo, well not really a fix, but i don't hear it anymore.

The Car
1985 Mustang GT

The Motor
Stock 5.0 W/ Edelbrock 625 4BBL
2.25" True Dual w/ Flowmasters

The old car
1998 Contour GL V6 ATX with a few mods