OK, Friday I pulled the intake manifold and replaced the two manifold gaskets as well as the throttle body gasket. There were also some leaks in the hose that vents between the crankcase and both valve covers. All other hoses were refreshed as needed and wires and hoses run a little more cleanly. I fixed the turbo-to-coolant-tank hose with a longer one while I was at it.
Pics show everything off, followed by full reassembly 4 hours later.
Results: best yet - the idle problems are 100% gone, the motor runs like a top, and boost wants to go to 10psi now at stock settings. The whole car drives smoother now, it feels great. Still some minor pulsing at WOT, but I'm hoping that a full injector clean plus a new fuel pump will iron that out.
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"Trend Number One is that people aren't getting any smarter."
Dogbert
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