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Car idled fine before changing to return fuel system. Now the idle surges between 800 to 400 rpms up and down. Changed IAC valve just to see but still the same. My tuner said it could be a vacuum leak the only vacuum line I took off was for frps that I put a t on for the regulator vacuum. Just...

Looking for 2.3 vmp or 2.3 Whipple Supercharger.