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DOHC not running right


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My 2b Sierra 2.0 DOHC EFI, isn’t running properly hunts really badly at idle I have to keep my foot slightly on the revs at lights or feels like it’s going to cut out, standard Ford ecu fitted, bottoms out at just under 80mph, any ideas welcome…….. I don’t want to spend mad money as I’m planning a engine conversion for winter 

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If it's similar to the pinto, it's probably caused by the the idle air control valve being stuck - try removing it and cleaning it out as a first step.

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