help lumpy running terios

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can anybody give me a start point on this lumpy running terios.
bought this car to repair with an engine running on 2 cylinders at best, starts first time but runs very lumpy
I fancy head gasket but haven't done compression checks or anything else yet , any favourite faults done 101000 miles, thanks malcolm

Also igniter box if it's there

Worth checking the igniter box also, if it has one fitted. If your in need of a manual then contact Bobf Smile

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'12' Plate Mazda MX-5 2.0 litre NC 3.5 Venture Roadster 160BHP
'15' Plate SEAT LEON 184 FR TDI. 240BHP/500nm Torque.
Past: '53' Plate Yellow YRV Turbo Approx. 150BHP

lumpy running terios

thank you buddy someone else suggested coil packs, they seemed to check out ok.
I have a feeling this could turn into a burnt out valve now, as we checked the compressions at weekend number 2 cylinder didn't register anything.regards mal