Idle Issue

Checked the plugs they were all misgapped and played with the timing brought it closer to the zero mark and it lowered the idle considerably also shut down sooner so Ill run it up a bit today. I think Im going to get another carb rather than playing with this one at least that way I have a back up. Would lose valves cause this by any chance? I can hear a miss when its revving while the chokes on not bad but noticable and so far thats the only thing I havent tried. I looked under the car and hoses ahve been replaced at the tank and the strap bolts have marks where they were taken off so I feel confident the previous owner did take off the tank for cleaning. Thanks again for everyones help. :rock: