ghosts in the machine..sometimes.
when i first acquired my zr1
service lights..would come on then off,
when it thaws out...up yonder,,drive the car around 50 mile or abouts
open the secondaries (like you could stop yourself)
after showing a little love, some lights will stop
if they persist...then you can address them,
cars w/low miles or at least mine, have these issue's..
i later replaced..all by myself
the map hose,
most fixes..you can find the info, right around here,
where to get parts..and who and why ..
enjoy