Hey guys looking for some advice. I have a 69 Quadrajet with a divorced choke that is running like crap on cold starts. I will do my best to describe the problem. Upon cold starts the car starts and struggle to maintain 600 rpm. The high idle is set for 1200 rpms, when it is struggling the high idle cam is up, choke is closed with the proper 1/4" space being pulled from the choke pull off. also worth mentioning it is running rough as if it has a miss or is starving for fuel. If I keep the car running eventually the idle comes up to the 1200 rpms with no change in the choke or fast idle cam which all appear to be working properly.
Next time of cold start, have assistant start engine and you open choke plate manually to see if it smooths out.
If so, then you may need to bend the choke pull-off rod to open plate, since it reads like choke pull-off is working.
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puff puff-Nice article, thanks. Thought I would update everyone on the issue I seem to have resolved. I put a rebuild kit in the carb. over the summer, car ran fine afterwards. In going over everything trying to find the problems I found the screws holding the carb together were loose, probably from the change in temp. tightened them up along with the carb to intake bolts and bam! Running fine on cold start up. I guess everything shrank when it got cold and loose screws/bolts led to leaks causing the problem.