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Almost always, the described idling problem would be a carb issue. The carbs set has to be pulled down, fully dis-assembled, all non-rubber parts soaked in carb cleaner and cleaning be done specially on the jets and pin holes.
In some instances high idle could be caused by a vacuum leak in any of the rubber coupling between the carbs and the intake manifolds.
The check engen light should be on if it's a fuel prob. or other senser such as an idle air controll valve. If no light is on, clean the throttle body and add fuel system cleaner.
hi im josh in cebu phils. mark the problem centeres in your video card try to check if it is in the proper temperature (not heat or hot). check if it is seated firmly in the slot.
well there could be couple problems happened to mine only cuz the troddle position sensor wasn't working properly. so while idling the rpms would go up and down then sometime shut off eventually. but when you mean rev up and down you mean idling irregular? if so your timing belt and or pulley's worn fuel pump not delievering enuff fuel to fuel injection system, leaking egr valve, or even the air filter clogged.
I had that problem with another one of my vehicles. It ended up being the fuel pump. The problem was that I let the fuel level in my vehicle get to low, and that the fuel filter inside the pump had gotten debri from the bottom of the tank stuck in it and it was starving the vehicle for fuel. Eventually my vehicle wouldn't start. I had a tow truck driver tell me what the problem was. He banged the side of the fuel pump real hard and the vehicle started right up. I eventually had to replace the fuel pump.
Hope this helps.
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