Yesterday at startup a single misfire was to be heard, ??? so went to work (no fast or spirited driving on THAT ride. Then when I got out of work I discover I have no power over 3,500RPM... Wierd feeling, like driving a car with a plugged exhaust, or a Yugo!!! Was fine up to 3,500 or so then just no power!!!
So I figger' Dealer time... Then I stop at a store and when I come out I decide to jiggle the connection on the secondaries (I know where they are 'cuz I played with them long ago) a long screwdriver alongside the linking bar and a bit of pressure on the link and they move! Then my ride ran fine. Just posting 'cuz you may have the same problem someday.
(I prolly' need to go in and clean those secondary intake butterflies, maybe next time, if it happens again)