I think I see the gasket you are talking about now. I sprayed WD-40 around it and after a short delay noticed the engine did run a bit smoother. I think it may be the gasket although the engine will sometimes run quite smooth on its own for a short time so I'm still not certain that is the only problem. As an expert, do you think the replacement of this gasket is a job that should be undertaken only by a trained mechanic or could it be done by a somewhat mechanically inclined person who can do some minor repairs and upkeep. The throttle assembly seems to be held in by 3 bolts into the engine block. If these are removed can you lift it to replace the gasket after disconnecting the attached hoses and linkages. My concern is that these holdown bolts have been in there for 20 years and may be very difficult to deal with.
I do value your help and will not skip out on payment!