Is the Terminator throttle body supposed to have an o-ring between the back of the TPS sensor and the boss that the primary throttle shaft fits through? I've been chasing a vacuum leak. Did a smoke test and found small leaks around linkage side of both throttle shafts. Found a bigger leak coming out from behind the TPS sensor. Removed the TPS and there was no o-ring. Was told by a knowledgeable person that it's supposed to have an o-ring. Holley Tech said that an o-ring does NOT go there. There's a nice chamfer like it's made for an o-ring. But mine didn't have one. What gives?