A bad fuel injector could definitely be the culprit behind your idling issues. When one injector malfunctions—either by getting stuck open, closed, or clogged—it disrupts this balance. This can lead to uneven fuel distribution, causing your engine to idle roughly, surge, or even stall.

To diagnose this, you can check the injectors yourself or have them tested for proper operation. Look for signs of blockage or leakage. Depending on your findings, you may need to clean, repair, or replace the faulty injector to restore smooth engine performance.

Let us know if you pinpoint the exact cause and get your engine running smoothly again.