[97Formula]

I have another thread going on "strange cold starts" where after the cold start the RPM's drop to 800 briefly then go back to 1100-1200 for cold idle (issue started 2 years ago). I still have this issue and just recently noticed the dash lights "dim" a little right when the RPM's drop to 800, the same time I hear the AIR pump turn on.

Now here's the strange thing -- I never blew a fuse for the AIR pump nor did I ever get a SES light. Other than the RPM drop, I don't hear anything abnormal (the AIR pump still has that hi-pitch whine). Also on a "cold engine" if I turn the key (without starting), I hear the fuel pump prime followed by a slight "pop" and then turn off the key I do not hear a "whistle" (like I do when I turn it off on a "warm engine"). I did have that AIR pump recall done back in late 2000 (supposed to prevent corrosion or something).

I guess I can try replacing the underhood relay to see if that fixes the issue but I have a feeling I may need to replace the actual pump. Does anyone know the part# and where I can find one (if it has to be AC Delco, because I know I can get remanufactured units from Advance or Autozone)?