Trouble with storing a bike these days is that modern fuels containing ethanol (E5/E10) go off very quickly. The ethanol draws water from the air over time and this water reacts to form sulphuric acid which then eats away at metal (particularly aluminium alloys, brass and copper) and rubber components in the fuel system. Ideally you need to drain the tank or add a fuel stabiliser.

If you just 'topped' up with fresh fuel, then you will have only diluted the 'off' fuel and there will also still have been a lot left lurking in the fuel system. For the sake of a few litres of fuel, I'd drain the whole thing down and refill with fresh petrol using a fuel conditioner and injector cleaner additive and try that first.

It may be the TPS, but you can check that with a multimeter if necessary if the problem still persists.

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