87 Chevy TBI 350 Idling issues
 

I have an 87 Chevy with a 350 TBI motor that I have been trying to solve idling issues on for quite some time now. Can anyone who is pretty knowledgeable with this system help me or can someone tell me where I can go to get some good help. I don't even mind paying for a good technician. This truck has stumped three garages now and I'm almost at a dead end. Any help would be appreciated, thanks!