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engine surging up to 3k changed plugs leads coil pack maf please help


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revs free and clean when staionary when driven it surges really bad and i have a massive lack of power till 3 - 31/5k then goes ok accept in 4th and 5th wont pull past 5 1/2k,i have changed plugs coil pack leads maf sensor ran injector cleaner through and its still the same it does seem a bit lumpy too

have also done headgasket and since compression tested it all 8 1/2 except one but it was still 7 1/2

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