Engine idle surges up and down, I think it's going into "limp" mode. Eventually it will die. Right after that you can hear the valve "clicking". I think it was clicking during the surging but you couldn't hear it for the engine running. I'm wondering if that's my problem, this valve is opening and closing or "locking up" somehow. I just wonder is it normal. I guess to find out, I'll have to find a like car, kill the engine by unplugging the EZL while running, and listen.