Nissan Primera 1.8 P12 start up fluctulating rev p

Hello. I'm new to npoc and hope I'm posting correctly. I'm driving a nissan primera 1.8 P12 manual saloon 2002. When I start d car in d morning the rev meter fluctulates for a while and engine stops.. I have to restart it a few times before the rev meter stops fluctulating. Now it's getting worse and I fear it might not start one morning. But once the engine gets running it is okey for the day and I have the same problem next morning. Can you please help.

Thanks, just back from d garage. They said timing belt needs replacing. They are quoting £400. Car probably is only worth around £500. Is there anyway timing belt can be repaired/ adjusted without replacing?

Yes sorry timing chain.. I just spoke to him. He said he can try adjusting it for £150. Does this work? Finances are tight so was wondering if it's worth a go or will I end up spending for timing chain anyway plus £150. I just need a temporary fix for 6 months or so and I can get a new car. Should I risk 'adjusting' or is it a bad idea. Thanks

What are you planning on doing with it after the 6 months? Sell it or scrap it?

The chain tensioner normally adjusts the chain as it wear's gradually over time,however if it's worn to the point where the tensioner can't adjust anymore, then it's the chain you still need.You can check this by seeing how much the tensioner is protruding,the limit is 12 mm.