need help on this one, after the car came back from the garage i have very little power on my 1983 Z28 camaro. they changed a couple of things on the carb to pass smog test. when i set the idle mixture screws more then half a turn out from seating the car runs really rich idling. factory setting is 3 half turns, it was when i brought it to the garage and it ran fine. but not anymore. carb is a holley 1850 secundairy vacuum on a bone stock 350 ( exept for the intake, dual plane weiand)
i am no longer on speaking terms with that garage so i can`t ask them what they f*ck`t up where do i start looking thanks in advance