85 Westy Automatic, 155k miles.

Has been getting 18mpg or so on the freeway, so I think it's overall
in reasonable tune.  Major problem is a rough, stumbling idle that
smells somewhat rich (although the plugs look normal).   Also has a
coolant leak (I think one of the heads) and burns about 1/2 liter of
coolant per tank of gas.

Recent work:
   New cap, rotor, plugs & wires
   New AFM (rebuilt)
   New Oxy sensor
   New DIS (digital idle stabilizer)
   Adjusted valves
   Cleaned/adjusted Aux Air Valve
   Fixed vacuum leaks
   Grounds are clean
   Set timing, adjusted idle air screw.

Since Air & Spark seem to be ok, I'm now thinking that this must be
fuel?   Would dirty injectors cause this?  If so, can I clean them
myself?  If not, does anyone offer a injector swap service (buy clean
ones, send in my dirty ones as a core?)  If not injectors, any thing
else obvious to check?

Thx in advance!