1994 Geo Tracker • 161,000 miles

My 94 geo tracker will start and idle a little high but will continuously rev up and down by its self any help? I changed spark plugs and wires
July 2, 2012.

I am going to give you a diagnsotic walk through for this situation that goes into great detail. When it mentions pulling trouble codes, you can go to any Advance Auto or Auto Zone and they will pull them for free. Just use the link below;