No, I haven't had that problem. You know how it flickers when you turn the key to start the engine? Sometimes mine stays on and I have to shut the engine off and recrank it. I have mine idled way up, 1500-2000 so your flickering may only show up at the normal idle speed. I'm still learning to trust mine but it seems to be consistent. I think it's helping my e/t consistency, too. My only other problem is that I've got it sticky velcroed to the dash and in the heat the glue liquifies and it slides off to the side ever so slowly.