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If the idle mix is intact LEAVE IT--it's bad Aisin juju, right up there with diddling a MAF on the EFI.

The aux air pump is another poor idle culprit if everything else is working okay and hooked up correctly.

Where is this pump and what does it look like? Any way to bypass it to check to see if that's the problem?

Red 1996 S10 Zr2 (Semi-Retired Wheeler)
'84 Toyota on 36's (Project in the Making)