Stumbles 7 skips and wants to shut down once in a while

Does engine stumble and idle too low and die? This can be tune up issues, dirty idle air motor, dirty or sticking EGR, bad coolant temp sensor, clogged cat converter or muffler, bad O2 sensor, weak coil of bad ignition module, and more! You need diagnostic tests and readings.

Check for dirty IAC (idle air control), maybe EGR and throttle blade dirty also. Could also be bad coolant temp sensor, MAF/MAP, bad o2 sensor, tune up items.

Idle is controlled by idle air motor and they can get dirt clogged and be cleaned. Of course, all tune up items can also cause this, as well as bad O2 sensor, TPS, EGR, and others.

have you replaced the egr valve

why not finish the tuneup, spark and air filter.
also the EGR valve is a 50k service point.
if the EGR sticks open, Just before a stop sign driving
this is a sure sign of a stall ,by EGR. failure (clean it)
my pat gas.
so you are really saying, the rpm drops way below normal?
at idle , then stalls.
but the fast right foot saves the stall?
below 400rpm most cars stall. 300 for sure.
the CEL will flash on just at or just after the stall. RPM based action it is.
and if the stall is easy to save?" is it, super easy,? then the ISC is failing, the idle speed controller.
if on the other hand the skipped fuel tune up, its all nasty bad spark then all hope is lost , for ISC and ALL.
do the tuneup first, see the list?

P1195 refers to the map sensor, not the egr solenoid. It could be a bad map sensor, bad wiring, or possibly a bad or loose vacuum hose.
P1522 refers to the air control flap actuator on the intake manifold. You can see about yhat at the link below.
https://www.autocodes.com/p1522_mazda.html

Did you change the TPS - throttle position sensor . Have you check for vacuum leaks . O2 sensor ? videos on youtube on how to test !
GM OBD Trouble Code 44 4 & 6 cylinders ? head gasket Do a compression test on those two cylinders .

Hello! are you using the harness for that year LT1? the fuel air mixture is controled by the Manifold Absolute Pressure (MAP) sensor, the Throttle Positioning (TPS) sensor and the Oxygen sensors...When you put your foot in it without O2 sensors there isn't any control over fuel/air mix and ignition advance if the MAP and TPS aren't connected...I'm assuming your using the LT1 ECM...Guru...saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

RPM's up and down check EGR valve and sensor. EGR valve and sensor control idle. That's why your getting the surging on rpm's and this could be giving out the other codes. If mass flow was bad car will not start and the same for the map sensor. O2 sensor measures gas and air for right mixer. TPS controls 0-60 speed as in throttle respons.

Might just be the timing is off a bit, turn your distributor or if it has a carburator, the choke might need to be turned up.