It’s very likely to be a sensor problem. If the sensor in question starts to send false information to the car’s computer, the engine can do all sort of weird things. I’ve even heard of things like ...
The VW 1.4 TSI engine uses a cam-chain rather than a rubber toothed belt which needs periodic replacement. As such, the cam-chain should last the life of the engine (and the rest of the car) but ...
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