Without tearing everything apart,first i researched as much as i could
about ANYTHING rough idel,,searching mazdatrix site,found a "how-to"
section.In that section the topic is "coasting valve" shows how to test,
I test my 7 ,,and it was right on the money,,it was sucking air BIG.
now i know to get a new decel. "coasting" valve,, BTW,,,
my plugs,wires,cap/rotor,fuel filter,and spark were all ok,,too,,,nailed that MF

 

I checked this out right away and concluded two things 1. My coasting shutter valve whatever thingy is pooped 2. It seems like and absolute pig sty to try and fix myself?

 

its actually easy. you unbolt the carb, and swing it out of the way (no need to disconnect anything i think), and then its right there. its really a 15 minute job.

 

Locate the arm that controls the movement of the shutter valve, then wire it open?