Poor engine performance

every now and again this shows up on the dash and the car feels like its only running on 4 cylinders sometimes it clear on its own sometimes you have to switch the engine off for a while then its ok for a while.
can anybody help.

Hi Peter welcome to the forum, sounds like you need to have the car scanned for codes if you haven’t already done so.
If you are in the USA then some parts places will do one for you.
I don’t think the read out on the dash would say ‘poor engine performance’ does it? Perhaps ‘restricted performance’ ?

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Gone in to be checked I’ll let you know how I get on