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Engine & warning lightsRough Idle: 6 Causes and the Cheapest Order to Check ThemWhy your car shakes at a red light and how to test each cause from cheapest to most expensive.Engine & warning lightsCleaning Carbon from the Throttle Body: When It Actually Fixes a Rough IdleHow a sticky carbon layer builds up around the throttle plate and causes unstable idling, and the right way to clean it without damaging sensors.Fuel & economyClogged Fuel Injectors: Symptoms and Cleaning or Replacement CostRough idle and high fuel consumption? A guide to diagnosing clogged fuel injectors and the cost to clean or replace them.