Car doesnt want to start

[Blue_Cuppy]

Clio 172 cup doesnt want to start. 2 out of 10 times it wont start, its been going on for a few months. Sometimes its fine and then it comes back, what could this be?

Im getting the car serviced soon as it hasnt been serviced for awhile.

Thanks

 

[timps]

TDC sensor maybe be dodgy. Cheap to buy, 10 minutes to fit. It's the first thing I would try