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Hey guys the idle on my car has been messed up lately...it will slowly drop from around 850-900 which was typical to about 5-600 then it will jump up to 1100, then idle back down and it constantly does this. There are also times that if i tap the gas to rev a lil bit to correct this it will jump to 2000 rpms on its own and then sit there a few seconds then idle back down....

Anyways im pretty sure its the vacuum lines, but i was wondering if i need to replace ALL of the vacuum lines or if there was simply one that the idle ran off of...

Any help is greatly appreciated, especially links lol

Thanks for the help
 

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pretty sure its your IAC dirty or something else. if it was vacuum your car would struggle to stay alive at idle or stay consistant at a high rpm and you'll hear a spark knock from a lean mixture

best way to check vacuum leaks is carb cleaner
 
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