Why rpm goin up and donw in my1995 Honda Passport?

Fluctuating RPM in your 1995 Honda Passport can be caused by several factors, including a faulty idle air control valve, vacuum leaks, or issues with the fuel system, such as a clogged fuel filter or failing fuel pump. Additionally, problems with the ignition system, like worn spark plugs or ignition coils, can also lead to inconsistent RPM levels. It's advisable to perform a thorough diagnostic check to identify the root cause and address any underlying issues.