Cook egg noodles according to package directions. Drain and toss with a tablespoon soy sauce to coat all the noodles. Set aside.
While noodles cook, cut pork tenderloin into ½ inch pieces and place in a bowl.
Stir together marinade ingredients; 2 tbsp soy sauce, 2 tbsp rice wine vinegar, ½ tsp sugar, and ½ tsp salt. Pour over pork pieces.
Add 1 tablespoon corn starch to the pork and use your hands to massage the marinade and cornstarch into the meat. Set aside to marinate for 10 minutes while you prepare the vegetables.
Chop veggies and set aside.
In a small bowl combine sauce ingredients; 2 tbsp soy sauce, 2 tbsp rice wine vinegar, ½ tsp sugar, ½ tsp garlic powder, ½ tsp red pepper flakes and ½ tsp salt. Stir to combine. Set aside.
Heat 2 tablespoons oil over medium high heat in a wok or large skillet.
Add marinated pork pieces and stir fry until lightly browned. Do not crowd the pan, cook pork in 2 batches adding more oil if needed. Remove pork from wok with a slotted spoon. Set aside.
Add vegetables to the wok and stir fry for 3-4 minutes just until vegetables are crisp tender. Stirring frequently.
Add cooked egg noodles to the wok and toss with the vegetables.
Return pork to the wok and stir to combine with egg noodles and vegetables.
Add the stir fry sauce and toss, stirring continuously until sauce is absorbed and thickens slightly, about 1-2 minutes.
Remove from heat.
Serve immediately topped with a sprinkle of sliced green onions.