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As always with running concerns there's two ways you can go. Either do the job properly with a diagnostic aid, or go hit and miss changing expensive sensors/actuators in the hope that it fixes the problem. Waste of my time, and your money. In the long run it's better to do the former, especially when the symptoms could be caused by any one of a few components. I would be tempted to say TPS but without a code given by the module, wouldn't recommend fitting one.
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