Hello, I recently adjusted my valves. Thought I did it correctly. It starts fine, idles fine, but when I put it in gear, it will die. I did not have this problem before. There was a lot of rattling prior to adjusting the valves. It was quite loud. Now if purrs except when I put it in gear. When I get it going and drive it it is sweet at higher speeds. Everything is ok, until I let off the gas and brake to a stop or corner, it then idles down and makes me worried about it dying. My ideas on this are the injectors need replacing, vacuum leak, or maybe the valves were set incorrectly. I'd appreciate any and all ideas.

Question, which line is it to the fuel pressure regulator is the vacuum line, the top or the one from the bottom?