My main problems with my 90 745T:
Pretty much every part of the interior fell apart
Endless electrical issues. Yazaki gauge cluster was in and out about 10 times because various gauges died.
Had to convert the HVAC over to manual type, as the original one and replacement climate control units just didn't work.
Heater core leaked, RHD replacements only available from England from a seller who doesn't deal outside the UK.
I could never find front strut tops that would last, and the solid strut tops made the ride unbearably harsh over bumps even with 205/70R15 tyres.
The tailgate rattle drove me nuts, even after installing an "anti rattle kit"
Various exterior trim seems to randomly fly off and is difficult to find replacements.
It leaked rainwater into the footwell and nobody could ever diagnose it. It wasn't coming from the windscreen.
It did drive fairly well, except I could never really dial out the understeer. It was good for towing.
Eventually it frustrated me so much I got tired of fixing it.