If it is just mechanical problems regarding fuel/engine running etc, a mk1 haynes manual should probably suffice.
I did have a similar problem, and found the fuel line to be leaking as it enters the engine bay.
This week she was turning into a proper little madam to start too, but that turned out to be due to the head gasket on its was out, causing one of the plugs to become rusted and fouled, and not having a strong enough spark to fire her up. anyway, she is at the doctor this week having her head pressure tested (just in case), so hopefully, things will be back on track for her soon.