Not idling?

Hi There, I have a 1400 Golf 1 carb driven. I have had endless hasles with a rev problem. I put in a new carb kit and it was running fine however now it refuses to idle and if I pull out the chock it revs go up and down. When I take the carb off and check it and clean out all the jets I put it back and its fine ag ain until I rev the car then its back to not idleing. If I pull out the chock and drive, the revs increase when I turn left and decrease when I turn right. Also the car doesnt switch off straight away when I turn off the key. Any ideas what it could be?