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You would be wise to get the Lonelec cable recommended by the developer. It's pretty cheap. Just out of curiosity have you checked the rear TPS to make sure it's tight? It's only held by one screw. I I had mine vibrate loose once but it never caused a fast idle, it just caused a loss of power. Could be something wonky with the stepper motor if it still has one. Once again TunECU is needed.