Not the throttle body, but the Idle Air Control valve.

There were several models of IAC. The moosing comes from a resonance that sets up in the IAC tube because the spring on the IAC plunger was well....wrong I guess. Some cars moosed and some didn't. I believe they used a stiffer spring later on.

Former owner of '99 CSVT - Silver #222/2760 356/334 wHP/TQ at 10psi on pump gas! See My Mods '05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red '06 Mazda5 Touring, 5spd,MTX, Black