Got your text. Does it still start and idle fine? Or has that changed?
Your plugs are going to get covered in shite - the engine's been stood for a long time, and there'll be a fair degree of moisture in the oil and fuel. My own car ran like a sack of shit after not using it for 6 months, usually takes a good ragging followed by a fresh tank of fuel and an oil change before I'm happy with things after a lay-up like that.
Lots of cold starts with it overfuelling will eventually poison the plugs too. Sometimes you can resurrect them with a blowtorch, but when doing my Emerald conversion and mapping it I got through 2 sets of plugs as my starting point was so far out that the rich mixture quickly fucked a set of plugs beyond redemption.
If you're not already using them, then I'd try using a new set of NGK plugs (as they're much cheaper than Bosch, and equally as good) and see how it goes.
How old's the fuel that's in the tank now?