Here's an issue I've been trying to solve for about a year now.
Stalling and Shaking of the vehicle, after driving around the city for about 10 - 15 minutes (this doesn't occur during highway speeds ever)
Also, generally the symptom only shows up once I begin to decelerate, and will lessen or disappear once I start to apply more gas
Things I've done to try to fix the problem include:
Changing PNP Switch
Replacing Ignition Coils
Cleaned Air Mass Meter
Changed Fuel filter
Changed Fuel Pressure Regulator
Changed Fuel Pump Relay

Any and all thoughts/suggestions are much appreciated!
Thanks ya'll

 

did you check for intake air leaks? A small leak will impact the idle and the deceleration stability. You may need a smoke test to find more obscure leaks but I'd check the vacuum lines, air boots, idle air valve, throttle body, injector seals etc. Spray around with carb cleaner to see if it bumps the idle.

Did you clean the throttle body/idle valve?

I assume you have done all the ignition components not just the coils?

 

If you haven't already, try re-seating the engine control module's connector plug to clear any possible microcorrosion which might've developed between the module's terminal fingers and connector plug assembly over the years. When it works, it's a quick-fix for all kinds of operational gremlins.

This recently cleared a similar problem our 960 was having after 25 years of assembled service...