Intermittent check engine light and rough idle on your Grand Cherokee V? Learn the most common causes—from vacuum leaks to ignition coils—and how to safely diagnose them before they turn into bigger problems.
You're sitting at a stoplight in your Grand Cherokee V, and you feel that familiar shudder—the idle dips, the cabin vibrates, and then that check engine light starts fluttering like a nervous butterfly. It's not a steady, hard fault, but an intermittent flicker that comes and goes. That pattern tells an experienced technician a lot: it's often a sensor or ignition component that's been failing intermittently, not a catastrophic mechanical issue. Still, let's not take chances. Let's break down the most common causes on the WL-generation Grand Cherokee and get you on the road to a smooth idle.
