My 197 has been sat for a while, charged the battery up for 24hrs and now the idles very lumpy And sometimes even shuts off by itself. Won’t rev over 2.5k and misfires sometimes. Electrics seem iffy from what I can tell on the dash as the lights flicker like mad. The power steering is also now not working. Anyone got any ideas what could be causing this? Alternator? Knackered battery?