i've got one that i just can't figure out. picked up a used one and, just for fun, threw it on the truck as is to see how it was. well after tuning to highest idle i could not lower the idle with the idle speed crew in order to do the normal lean idle drop. so i took it off and got a rebiuld kit and have had the damn thing on and off my truck like 10 times and still the same. plus it seams to make the truck idle rough which leads me to believe that i some how have some internal vac leak in the carb. so far this is what i have done to it: checked the base for straightness- its straight, epoxied the fuel wells, set the float as per the specs, intalled the kit (gaskets, accl pump, etc) and even tripple checked that i got the right kit and the gaskets matched. everything looks good except it looks like the P.O. took the butterflys off at some point and also removed the little deal on the secondary throttle shaft that keeps em from opening when the choke is on. still, it looks like the butterflys seal well when closed. so i'm stumped. the other q jet i have on the truck has been given the same treatment and runs perfect. oh, and yes, i check my timing and its correct and i don't seem to have any other vac leaks. anyone??? buy the way, this is an edelbrock 1904 q jet with electric choke.