97 Mazda Protege codes

First let me start by telling you the problem i have a low rpm miss on cylinder two with the engine under load from idle when the clutch is let out through 2500 rpm then it runs fine the only ses light code was for missfire cylinder two but after resetting the light and running the car at idle the pending codes were as followed
P1800 Undocumented
P0200 Injector Circut Malfunction
P3700 Undocumented
P2>00 Undocumented
P00?< Undocumented
B3200 Undocumented
You may say ahhh P0200 bad injector or short in the wire causeing miss in #2 cylinder as i did but i checked connections and traced wires nothing, so i cleared the codes and left work, the car didnt miss the whole 15 miles i drive home, but this morning on the way into work it did miss especially at cruising speed in fifth gear.

So my question is why is my motor missing, What are these undocumented codes

info on the car it is a 1997 Mazda Protege DX 1.5L DOHC Manual Tranny with AC Power locks & Windows

Any sugestions or help would be much apreciated because i am woring with an outdated snap-on red brick scanner dosent tell me a whole lot of info.

bamcspeed what code reader or scanner are you using .
I came across a simula problem like this one and found that the PCM was faulty.
Did you try another Scanner to be sure of the codes that it was giving out
some scanners can misread codes.

i was using one of the red snap on brick scanners in generic mode and the only other scanner i tried only reads cades that trip the light not pending codes like you can with the snap on scanner but since i posted this i have not had any missfires it just fixed its self the only code still tripping the light is egr flow malfunction wich always comes on so i keep resetting it

there's tsbs out about egr issues on mazda"s normally it's a plugged port not the valve!