Gas Recirculation Valve (egr Valve) problems of the 2016 Mazda CX9

11/16/18 towed for inoperabilty. Stuck fuel injector/ ruined engine. All panel lights came on. Kept car for 57 days. Fuel injector # 1 failed. We were driving onto interstate. While working on car, exhaust stud broke off into turbo charger housing. Drilled out and rethreaded took back to Mazda dealer to c/o about swooshing noise in r dash said they did not hear. This occurring with acceleration 2/7/19 while driving out of state on interstate , swooshing noise r dash lost acceleration while passing. St peters , mo dealership had to put back on the turbo hose & clamp 5/6/19 back home and again heard the swoosh noise on acceleration. Dealership replaced gasket to turbo charger / air leak with smoke test 9/14/19 again became inoperative while driving out of state immediately after passing large truck, lost acceleration with pedal to carpet. Was told in limp mode smelled something in car compartment. Stuck on narrow county road. Limped to turn off. On inspection by tow truck person, stated was pouring gasoline from front of car. �this could have caught fire due to 90+ degree temp in tex. Fuel injector # 4 exploded mechanic on inspection told serv mgr this car was put back together in a shoddy manner. The hose to fuel injector had previously been routed wrong when engine replaced. Now waiting on malfunction of fuel injector 2&3. Scared to drive car. C/o to Mazda customer rep. His response well u have warranty until 4/2024. That is b/c we took extended warranty. Hollingsworth Mazda in baton rouge, la closed reason unknown.