1. Prepare noodles according to package directions. Drain well; keep warm.
2. Heat oil in a large skillet or wok over medium-high heat 2 minutes. Add pork, and stir-fry 5 minutes or until done. Remove from skillet.
3. Add onion, mushrooms, and celery to skillet; stir-fry 4 minutes. Stir in soy sauce. Return pork to skillet; stir-fry 1 minute. Stir in cooked pasta and pepper, tossing to coat. Serve immediately.