Welcome DJSCIASCIA!
Glad to see both you guys getting going on our little comunity here.
For both of you the 2 problems plaquing the cars right now is:
1. Rear Busings on the MSP and the MP3 Proteges.
Basicly the rear bushings wear out do to Mazda down grading Racing beat original suspension design in production and now the upgraded suspension on these cars cuases the rear sway bar bushings to clunk since they loosen up. We have all been on a year long missin to try and get Mazda to get a real solution but so far the only thing they have done is issue a TSB to replace the bushings. Which, only stops the problem until the new ones wear out in 1000 miles.
2. Idle Problems are being observed on all types of proteges from MP3s with Turbos, ME

, to totaly un-altered Protege 5s.
Basicly the problem is a return to idle one, where the cars idle will fall very low, all the way to 0 rpm, or stall all together when the car has the clutch held in on deceleration. Basicly the problem is made far worse when under load of heater and head lights.
I have noticed it most potent if the clutch is held to the floor right after acceleration, before engine braking. Also Exhuast leaks seem to make the problme worse.
Thanks guys. If you like I can give you several links to these problems that are scattered all over the board.