Firstly some background. 2011 2.4 Puma 110 52,000 miles on the clock and was not used much by previous owners.
From cold the engine performs fine with no issues, it appears to start playing up when the engine is up to temperature. No error codes...
Sorry to dig up an old thread but i'm having this issue... Did you resolve it? Mine is doing this exact fault and i have changed everything you have done.. Please help