My gauge was reading 12hg at idle before Full PI Swap. Now it is reading 6hg is that because of the increased compression ratio? I noticed to after swap my car idles at 1000, was at 700 before swap do I got a problem somewhere. Pulled off IAC connector and no change in idle. I drilled and tapped the PI intake so I have both coolant sensors. Also my idle hangs too. Might have to do IAC mod.