Wait until it's dark out, pop the hood and check for sparks. They may have cracked a plug wire. Check your cap and rotar for "lighning marks." Also, make sure the ground strap in the cap that goes from the cap to the coil is still in there. Also, are you SURE it's a miss? They may have turned the idle mixture screws way down. That would cause it to run like crap too. Can you call or go back to the place and have them put it back to whatever it was before, or at least ask them what they did to it?
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