stalling and back fire when warm, no movement in carb mixture pins

[amcfool1]

hi 83 and earlier computer only adjusts fuel, afaik no knock sensor, 84+ computer adjusts timing as well as fuel. a more complicated system and has knock sensor. good luck, gz

[88formula]

Sweet!! Thanks guys!
So if the ecm isn't moving the mixture pins, and the ecm doesn't adjust the timing,  then I'm just going to set the mixture the old fashioned way, and put that ecm in the garage and forget about it!

[macdude443]

That's what most people do.  amcfool1 is correct.  The early system only did fuel mixture.  Set those pins based on the photo, pull the stepper plug then adjust your idle mixture with the front mixture screws.