adjust your valves, .012/.022 a little on the loose side of .010/.020. Also check your intake gasket. Where is that large vacuum line going? Plug it for testing purposes. Its PCV, not needed for idle testing. I bet you got low vacuum on a guage at idle, massive vacuum leak.
Awesome! Thank you. I’ll check for vacuum leak and re-adjust valves. I’ll replace intake gasket as it was sitting for about 20 years before I got it. I’ll update back on my next free day Thursday!
