> This did not complete solve the problem. I think also the electrical motor
> is sticky. Can anyone on the list give me some hints on how to get this
> smooth? How can I remove this motor from the IAC assembly?

Don't know about the '91 Accord but the IAC on my '94 Civic does not
have a motor. The valve is operated by an electromagnet. I doubt you can
get it apart and get it back working again afterwards.

> Should I spray WD40 at the IAC valve, or will this ruin things?

WD40 should do no damage but may not dissolve the gunk in the valve.
Carburetor cleaner (or throttle body cleaner) will get rid of the
buildup. Don't know if it would cause damage, but I would use it on my
own car if need be.