There are a few systems that affect the idle and cold start. Not uncommon for something to not be working right, most mechanics do not understand how...
If you are lucky it is only a simple electrical problem. If not, the plastic "tail" that pushes and pulls the mast up and down gets old, brittle, and...
This last video was great showing how difficult it can be doing exhaust work. An acetylene torch is indispensable. If you must have this kind of work...
I never saw a silicone gasket used there. The original OEM one was some kind of composite materiel that becomes hard as a rock. A real PITA to clean...