I had similar problems on my old VVC, except that once warmed, the idle would wander up and down, usually just picking up as it was about to stall, but occasionally stalling. Cleaning the IACV and the throttle body and butterfly improved it, but it still isn't perfect. PS I need to get rid. I no longer have the time or inclination for restoring it, as the body is in poor condition, but is mechanically sound, (replacement engine) and would make a good donor. It's an Rreg, BRG, with matching, hardly used hard top, which is hanging in the garage. Interior is sandstone leather.
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