Hi All,

Pulling my hair out here! I have a standard S2 which I brought out of 2 year storage.
Starts fine, doesn't miss a beat when warming up but suddenly runs lumpy as hell when warm enough!
I've replaced dead fuel with super unleaded plus fuel system cleaner.
Replaced coolant temp sensor - definitely not that.
Fully serviced, oil, filter, cambelt, changed fuel filter etc.
Emissions are fine (checked suring MOT)
Checked leads and plugs but I don't see how it could be an ignition problem if its fine when cold.
I can only think its a fuelling issue?? What tests should I do next?? Heeeelp.

Thanks!