I suspect, if it has not been used for a while, you may have jump started the car. If this is so, the OVP fuse can often blow, which would cause rough running.
So in addition to the above items, be sure to check the fuse too. Do a search on OVP, I have posted pictures of one before. It's only the fuse on the top you have to check/replace, not the whole relay.
Also, if you are looking for peace of mind, DEFINITELY replace all the existing fuses in the fuse box. It is very common for them or the contacts to corrode, and intermittently stop working.
This will cause you many headaches and lots of £$$ before you figure it out - It took me a few months of windscreen wipers mysteriously stopping temporarily, fuel pump stopping for 5 seconds etc. to do it myself.
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black