Hey guys, just took my car into the shop today to get it e-tested. Its been runnin real good since yesterday when I put new plugs, wires, distributor cap, and rotor on it... so i was hoping it would pass. Naturally, nothing works out properly. It didnt do so terribly tho, it failed one category. High rpms, it failed Hydrocarbons (HC). I was wondering what might be the cause of it? Cuz they want $75 for a diagnosis!!! So what would cause high HC at high rpm?