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Message: <blockquote data-quote="Brahh" data-source="post: 808799" data-attributes="member: 12800">I just recently finished a 10 month tear and build up, I ran into a bad surging idle from leaking headers, vacuum leak and a bad 02 but they were just replaced and there is absolutely no surging idle or any vacuum leak and it doesn't try to stall at every stop light or kill itself with harder brakes or etc. But one thing that it does do is a shift from park -> Drive or Reverse will make the car kill itself unless I slightly two step (~100 rpm) like I was beforehand with the surging idle after i'm in drive or reverse I have no issues whatsoever cold or warm. My mechanic buddy who is diagnosing it says there is too much vacuum pressure going to the crankcase and I should research to see if I can find a regulator or just a solution since he's as stumbled as me.Here are the mods on the car (If it helps):Stock 302 (.30 over)10:1 compression (Dome)E303Stock E7 heads (max ported)1.7 Crane Gold RR'sEdelbrock Performer intake70MM Edelbrock ThrottlebodyCAIUnderdrive pulleysBBK Equal length headersRemanufactured AODE2800 Stall Torque converter4.10'sNGK iridum spark plugs and NGK O2's9MM FMS ignition wiresNew alternator & BatteryEGR was deletedSCT chip with the american muscle canned tunes for the above modsIf anyone can give some advice or even some guidance on what should be tested, would be much appreciated!Best regards!</blockquote>