I need some help please.. I replaced the idle air control sensor and my idle still goes up and down from around 1500 to about 3000RPM's. I dont know what else it could be, some one told me it could be TPS or vacuum line but i dont know.. so please help me out.
air leaks from the throttle body or intake manifold gasket or any of the air lines running off the intake mani. wil cause a vacuum leak.
What year is your car and have you reset your ecu lately. If you have or if your battery went dead or I believe just over time you need to adjust your idle. If you idle is set too high it will cause a surge. You can try to lower it down and see what it does. There's a screw on the throttle body, use a flat blade screwdriver and turn it. You'll hear the engines rpm's lowering or rising, try and lower it down to I wanna say stock is 750 rpm +/-50 rpms. See if it's a simple idle adjustment or if it's something else. Also, you want to check your fast idle valve. Look in some of the FAQ threads for write ups and more info.
Hope it helps
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