MG ZR 160 Jerky

hey all,

iv got a problem and really hope some can point me in the right direction,

when i drive i fourth(4) speed and revs drop about 2000rpm/s,

approximately 40km and when i start the pedal mg start to jerky about 2-3 sec and then speed up normaly, i try to changed coil pack, spark plugs, spark cable, lambda sensor, HG, but the problem is still there, any sugestion pleaseeee

all the best

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