Hey everyone, havn't had time to really trouble shoot this yet being holidays and such so i am beong lazy and hoping someone has had this problem to pinpoint me to the trouble.. I installed a Brand new Holley Truck Avenger Carb on my truck, the trouble I am having is for starters.. hard starting but i think that is timing, the problem that bothers me is after i get truck started, and let the motor warm up for a bit, i kick my idle down and it drops to bout 800rpm which is fine but when i actually put a load like put it in gear and start to drive it increases in rpm and and goes to bout 13-15000 rpm, not sure why idle isn't staying down, figured choke might not be getting a full 12v which i will check tomorrow or some stuck linkage, the only linkage i have hooked up to carb though is my throttle cable, and when i checked that it didn't seem to bind and returned all the way...all other aspects of the carb work great.
For those about to ask, the carb is installed in a :

1986 Bronco...351w...c-6 automatic without kickdown leaver hooked up...weiand stealth intake...msd offroad ignition...msd blaster 2 coil...msd billet dist with vacume advance

Thanks

 

Moved to proper forum. Duplicate posts removed.

 

Try adding another return spring. If the motor mounts are weak, the engine will raise up on the drivers side under a load and it could be pulling the cable enough to open the throttle.