[Landseer]

Need to know the year. 32V cars are interference. Earlier cars, debateable but usually deemed not interference.

My process is to delay the startup. If stored inside, dry, process will be easier.
Complete grounds cleaning, fusebox out and re-fused, check inside console (under radio), behind CE panel at passenger feet, and in V of engine for mice, erradicate. If none, way ahead.

Some folks scream -- pull engine, do head gaskets, I never have and likely wouldn't.

Water pump failure on sitting is possible, but you will see that with mass leak within hours of startup, just don't go anywhere. If 32V, i would however do TB/WP before even trying to start. Very important.

Gas tank cleaning is prudent, new filter, maybe need to pull and clean injectors, often varnished, not always. If it runs hot, then you've got leaning and cloggage though BTDT.

Say more about year, condition, storage conditions please.

And location of you guys. Bound to be a 928 pelican or rennlister nearby and its a great group, if you are near me, i'm in to help.

Patience is a virtue with re-hab of these. Its sat 15 yrs. Can guarantee spending some quality time and a bit of money prudently prior to the restart will be the right long term path. Don't sell it, no matter what.