Further Advice Needed - Car not Starting.

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Hello Again.

Further to my previous issues whereby my car cut out and refused to start again, I have now had my car booked into a garage and they have checked the usual things like electrics, spark, fuel etc. However the car turns over and sounds like it wants to start, but will not catch. They cannot diagnose the fault.

Can someone advise me if this is likely to be an engine rebuild job, or will I be better off cutting my losses and selling it as it is. It cost me about 3k when I bought it a year ago.

Many Thanks.