car stumbles in the air!

[Dragsinger]

Jones,

judging by your first post you have checked the basics for a bad part. So, it is reasonable to look at other items. [and do not mean any disrespect, just beginning the brainstorming process] begin looking at the entire package in a different light. That is to say, go back and look carefully at every small thing. Look at every wire, every ground, every terminal connection, etc.

One idea is to have someone else drive the car while you look and listen, might give a different idea of what is happening.