Poor acceleration, rough idle & isn’t willing to go past 70

Hi all

Im having problems with my 2002 freelander 1.8. At rest the car rough idles and trying to accelerate joining the motorway or overtaking is a real struggle, tackling hills on motorways is a nightmare to watch your rev and speedo drop to a crawl with foot to the floor. The car also seems unwilling to go past 70 mph. also the hill decent light sometimes comes on and sometimes goes back off. I don’t know if these problems are all related.
I have had the head gasket replaced recently.

Any help would be much appreciated??

coil or one lead or spark plug breaking down [get it on diagnostics] rather than trying this and that

Poor acceleration, rough idle & isn’t willing to go past 70

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Check that plugs are not tracking down the side.
If you remove the upper cover and listen as it ticks over you may hear a sharp "crack" as the spark jumps down the side of the plug
My freeloader had the same type of problems till I changed the coil packs OH ! and a good set of plugs helps