Originally Posted by Turbo12279
Thank you...what is an IAC
IAC idle air control valve. It adjusts the amount of air at idle, less air when engine is cold to riches the mixture, acts like a choke. If faulty the engine will have trouble running at idle.
Shift interrupt switch shorts out ignition when coming out of gear only. This is to remove load from dog clutch to lessen wear coming out of gear.
Tune up seldom hurt unless you know it was done recently, yes a bad dust cap will cause a bad idle and even across the power band.