Thermoquad help

On the driver side of the secondary shaft you'll see two pieces that when enough throttle pressure is applied to make primaries about 2/3 open the one piece contacts the other and the secondaries open. Sorry I don't know the name of the pieces. That fast idle counterweight holds the the one piece down unless the fast idle screw is in enough to engage the steps. Then the secondaires won't open. Sometimes it's necessary to slightly bend the pieces make sure they engage every time.

Post a pic of the drivers side of the carb if you can. There are also several websites that have pictures plus rebuilding & tuning tips for the TQ. Just do a search on Google.