Doesn't the manual say to get plugs replaced every 10000kms?
Also, 2 more queries:-
My Wagon R's idle RPM stays at 900 i.e. just a little below the 1 mark, but still the vehicle shivers a bit. Matlab it is shaking slightly but I can feel it clearly, even the empty front passenger seat can be seen vibrating. Shouldn't the car be absolutely stable at 900 RPMs? Or may be I am still in the adjusting phase from shifting from Mitsubishi Lancer to Pak Suzuki's craftsmanship?
Second, my door open indicator lamp isnt glowing. It doesnt even light up upon first position of ingintion switch when all other lamps light up for a while, what can be wrong? A blown fuse or something else?
Thnx in advance.