still mis-firing/rough idle and shudder

still mis-firing/rough idle and shudder

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recently posted thread about zs+ with loss of power, rough idle and shuddering. Had ht leads , coils and spark plugs checked-all ok. Replaced spark plugs anyway. Compression test and cylinder leakage test done-all ok. Timing belt alignment and fuel delivery-all ok. I changed fuel filter anyways as she has just passed 60 000 miles! error code came PO300 -random/multiple misfire and fuel system-OL?
Tried doing Throttle reset from advice given from forum members- no change. she idles at 1194 rpm and the pre-cat starts glowing super red after a few mins after starting ignition.
Any advice or thoughts will be appriciated!

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still mis-firing/rough idle and shudder