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Hi my sons Vectra B had a Engine warning light appear and no acceleration at all ,early diagnosis is the accelerator potentiometer poor lad has also been hit with a cat cracking at the manifold could these probs be related or should i try and resolve the throttle probs then sort the cat out any ideas before i dive in
thanks
 

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Do paper clip test. Id certainly be thinking about the Cam shaft and Crank sensors. Not big jobs.

But yes mate cat can effect power.
 
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