RH bank running rich

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! It sounds like you’re having a frustrating issue with your 2010 Toyota Tacoma, especially with the right-hand bank running rich and the idle problems. Here are a few things to consider: 1. **Oxygen Sensors**: A malfunctioning oxygen sensor can cause the engine to run rich by misreading the air-fuel mixture. If it’s not accurately measuring the oxygen in the exhaust, it could lead to poor idle and high RPMs when you feather the throttle. 2. **Fuel Injectors**: Sticking or leaking fuel injectors can also lead to an overly rich mixture. If fuel is dribbling into the cylinders, that can cause the rough idle and high RPMs you're experiencing. 3. **Vacuum Leaks**: A vacuum leak on the right bank could disrupt the air-fuel mix, leading to an imbalance. Check for any damaged hoses or connections. 4. **Mass Air Flow Sensor (MAF)**: A dirty or faulty MAF sensor can throw off the air-fuel ratio, causing the engine to run rich. Since you mentioned it sometimes runs better after clearing the cylinders, it may be worth checking these components and running some diagnostics. A professional mechanic can help identify the exact cause. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.