94 c1500 4.3 4l60e. start it up. starts fine. idling ok then it'll stumble almost die then catch and keep going for a minute or so and do it again. go to back up and it'll die. doesn't have the smoothest idle in the world but it's ok. no check engine light but it has a obd1 code 67. has something to do with the trans torque converter i think. has a steady miss at about 1200 rpm in gear.filter and fuel pump changed 12000 miles ago. new plug wires, plugs are clean and gapped properly.
would like to get it to quit the stumble and miss any ideas?
what about the 67 code?
thanx

 

code 67 is the a/c pressure sensor circuit/ or a/c clutch failure. maybe the a/c pulley is ceased? try taking the belt off and turning the a/c? try some fuel injector cleaner you could have a dirty injector

 

on a 94 a code 67 is something to do with the torque converter lockup. saw the a/c stuff before wasn't for my model