Integrated throttle body and intake manifold spacer module

A throttle body (61) has a first body part (62) containing an upstream portion of a through-bore (68) and a second body part (64) containing a downstream portion of the through-bore. The two body parts are joined together to register the downstream portion of the through-bore as a continuation of the upstream portion at respective confronting faces of the two body parts. A throttle mechanism (92) is captured between the two body parts. The mechanism includes a torsion spring (78) external to the through-bore having tails (78A, 78B) respectively associated with formations in the exterior of the throttle body and in a cam on the shaft for spring-biasing a throttle blade (70) of the mechanism that is disposed within the through-bore to closed position.