The car is a 93 VW Cabriolet (Mk1 Golf/Rabbit).
I was parked with the engine on lowering the hydro/electric roof when the engine and power cut out. I couldn't restart the car so checked the battery and fuses - all fine, so I tried again. This time the car did start but now is idling very low, sputters a bit and the tacho twitches. Feels fine to drive - this seems to just happen at idle.
Have I blown some electrics? Fuel pump relay?