Have an idle issue on my 2001 blazer 244k. Been reading threads for a while trying to figure this problem out. Upon startup idle is low, around 300 and tries to die. If i rev it to normal idle or just take off everything is fine by time she warms up. If i hold it at about 700 rpm it slowly loses power unless i give it more gas. Heres my recent laundry list.
New alternator, distributor assembly, plugs and wires.
New spider, fuel pump and reground of splice pack, fuel filter, 60psi at the rails. New vacuum lines
New Intake manifold gaskets, throttle body and maf clean
New IAC and charcoal Purge solenoid, air filter and oil changed 500 miles ago. This is all i can remember at the moment. My dad left me this when he died and i will never get rid of it. Runs awesome, very well maintained, just this issue. All previous repairs had their reasons. These things are quirky, i need a second opinion, thanks guys

Chance