K12 Start up issues

Hey there

I recently brought a 2003 Nissan March K12 CR12de and the day after I got it, I started having starting problems. it does it when its hot and cold then sometimes it starts first pop but 9 out of ten times it takes 2 3 attempts for it to start up, I've read on the net that people have problems with the nats system but my car turns over it just doesnt fire up ?? I took it down to the mechanics and they charged me 350$ to replace the spark plugs with platinum ones and to clean the coils but it still does it anyone had this problem before or that could help me with it

cheers
 
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