@docc appreciate the suggestions.
i agree something does not seem correct as discussed perviously.
All sensors were replaced during last winters 20 year overhaul.
Guzzidiag was used to set Co trim to 0, also tried + 10 and + 5, but the current set up is TPS at 285, air screws 1/2 out, CO trim =0, idle 1250 per Guzzidiag.
No play in TB shafts, Ballanced TBs, No leaks intake or exhaust. New gasket/ sleeves in crossover, bolts with copper gaskets in intake ports, intake rubbers all good, have spares, didn’t need them
currently only at about approx 18,500 miles (quite low for 20 year old bike)
I did spend two full days doing runs on dyno and street trying to find the lowest combination of TPS setting, co trim and air screw setting to eliminate the misfiring between about 1800 and 2800 rpm, as a temporary fix until can change fuel filter and get injector cleaned / serviced.
As you suggested I am going to change the fuel filter (have one waiting) as soon as gasket arrives and last item will be to have injectors serviced at a shop this fall. I am hoping one of these will turn out being what is causing the lean running with TPS at 157.
Sure appreciate yours and the many others help in trying to solve this
Also happy it is running so nice right now even though it probably should not be!