rpm bouncing

when i start my car when its cold the rpm bounces from 2000 rmp and 1000 rmp and it dose that untill then care is warm and then stops.....what caould it be??

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How's your coolant level in the rad? How is it in the expansion reservoir?
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Tegger

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how can u check the coolant level??whats a expansion reservior?
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With the engine COLD, remove the rad cap. The level should be right up to the bottom of the cap, and bottom of the cap should be dripping wet. That is how you check the level at the rad.
Where the cap clamps on, you will see a narrow black hose. Follow this hose to the other end. That is the expansion reservoir. If you study the side of the reservoir (rub the dirt off first), you will see MIN and MAX marks. When COLD, the fluid level should be between these marks, preferably towards the upper one.
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