Hello, I have a 88 Accord (auto/carb). It intermittently has a problem idling back down to normal after starting it up. In a past email message, someone stated its common for this problem to be caused by faulty Frequency Valve C. Does anyone know if its pretty straight forward to replace? What price I'm I looking at to purchase this valve? I know the emissions on this car looks pretty complex to troubleshoot. I'd rather just replace it if its fairly inexpensive due to its age etc. Thanks, Terry