12 valve or 24 valve though? Huge difference, the 12v being the far more common engine. Could be either on a 1990.
They're needy cars, bar the odd one. Suspension leaks happen as they're getting old, things corrode, parts are hard to get other than second hand and it's not like there are tons around to pick from. My experience of them right across all ages suggests electrical problems are par for the course as well (the best being the 1992 that decided headlights weren't important in the middle of winter on a totally unlit country national speed limit road).
That said, they're very cool, the drivetrains tend to be robust and if looked after it can only gain value. Just make sure it's definitely your thing before committing.