Inconsistent extrusion

I have a ender 3 v2 4 yrs old have upgraded mother board and hot end all working well till 4 months ago when started to under extrude. have done extrusion test with 100mm of filament, found it was way short, went to steps mm which is set at 93? and reset to 118 as per calculation and saved setting. test print a Bletchy that went ok but next print was very patchy. Thought would be a blocked nozzle so changed nozzle and checked boden tube etc but still have same problem, changed filament cleaned nozzle again but still inconsistent extrusion. Any help gratefully received.
Thanks Bruce

Limit the flow rate to a reasonable value, check if the extruder gears grip the filament well and if the hotend is assembled properly.

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