ok i have a 1984 t/a recently got rid of the q-jet, and put on a edelbrock 600 cfm electric choke carb. when i start it up it will start fine and go its normal idol. (600 rpms). after i start to drive it and just sit at a light or whatever then the idol will go upto 2100-2200 rpms unless i gas it a littlebit then it will return back down to idol. it always does it and will always return back to 2100-2200 rpms after start to drive again till i gas it a little at the light or just parked getting ready to turn it off. can anybody help im sure this isnt helping my gas mileage any.

 

It sounds like a problem with the choke. Make sure you are getting proper voltage to the choke. Also, you replaced the distributor when you swapped carbs, right?

 

yeah im getting enough to the choke 12v and no i didnt replace the distributor dont see why that would be the problem though its newish.

 

If you have a non-cc carb, you need a non-cc distributor. The cc distributor is made to work with the sensors that come with the q-jet carburetor system. I had the same problem and ended up having to replace the distributor.

 

Either the throttle plates are sticking a bit of slop in the primary shaft. Clean up the bores & plates, then try tightening up on your return spring some. After using the carb cleaner, use some WD40 or a little motor oil to re-lube the bores.