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update:
holyoak reminded me of the idle air control valve.......duh. i pulled it off to clean it & check it. it was rusted solid; i couldn't even move it by hand after i opened it up.
i dug out the one from the boxster engine, gave it a good cleaning, & popped it in the car. ran TERRIBLE!!! way worse off. i reset the DME & voila, buttery idle. running very well now.
keeps getting faster every day. i gave a check ride to a forum member last night (byron in atl); he agreed it's a little scary. much faster than either of us thought it would be.
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