My '89 opens at about 4k, also. I researched the hell out of that AICS last year. 4k is the correct #. Always looking for cheap torque, I experimented with it by applying vacuum at different RPMs to see if it made any differences in HPs. None noticed, so I put it back to factory condition.
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Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing.
TEMS, and some nice MODS. Sold to a friend 10/08/08.
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