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Runs but at about 3000 rpm breaks down as if something limiting it

Just done head gasket and took out for a drive runs sweet but at about 3000 rmp engine runs lumpy and no powerUpto 3000rmp it is faultlessPlease can someone help I have changed plugs etc
 

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Re: Runs but at about 3000 rpm breaks down as if something limiting it

With limited model/year info, perhaps crank position sensor (CKP) either on it's own or in conjunction (If GEMS) being whacked by a broken reluctor ring. If GEMS worth a quick look behind the half moon inspection panel on the Bell housing.
 
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