Originally Posted by swebster
Junk yard bolt in fuel injection? Now you're talkin' my language! Tell me more!
Glad you found it, sounds like the the primary needles were never able to fully seat in the jets.
this is the "power valve" system in the Q jet.
Without the needles fully down in the jets, it was running rich all the time.
About the only time it was "right" was when it was at full throttle.
you will see a good improvement in mileage.
Just to note:
Since we have gone to unleaded gas, the "Exhaust pipes" don't burn that light gray that used to years ago, (that was lead deposits) they are a dark chocolate now.
Watch out, you just might like the ol Carb system!!