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Originally Posted by ex-ricer98gt
when i start my car it start off at 1500 then it dies down to around 700 - 800 like its suppose then after a minute or after driven for a couple minutes i go to a stop then it goes down to like 200 and up to 1100 then down to 600 and up to 900 it goes crazy, and its not my IAC cause i changed that last week, also when im driven around 20 - 35 miles per hour and i put my foot lightly on the gas my car bucks so bad it feels like my car is going back and forth only when im going that speed and when i put my foot slightly on the gas, i dont no what it is, im thinking soark plugs, coils, wires, maybe fuel injectors?
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Anything hissing underneath the hood.
Im thinking possible Vaccuum leak. When is the last time you replaced your PCV valve? Use carb cleaner and spray it over the engine bay. Listen for the idle change (it should speed up if im not mistaken). That should help you isolate where exactly your problem is.
Most of the time with vac leaks on these cars its not due to the hoses cracking (which I have done on my own, dont ask), but its due to the barbs that connect the hoses together cracking, producing a small leak. Even a leak that is incredibly small can still do this. I know. Its done it to mine before!