Continued from previous post...
Four spark plugs were replaced with new units. (Part No.:MS851357 , Manufacturer: NGK)
Unexpected issue popped up here.
Due to exposure to engine oil (+ may be time factor), spark plug cable head was deformed and lost proper sealing property. Even after hard try, it could not enter and seal the spark plug cavity and it kept pushing back.
Hence had to replace the spark plug cable set cost me Rs.9,474/= additionally.
(Spark plug cable set (Include 2 cables) : Part No.:MD365102)
After completing injector pressurizing and cleaning , re-installed all components.
Emission test was done and result was successful at both low and high RPM. Then scanning done and found no issues.
I did not replace genuine air filter from the agents as it is very costly and bough a VIC air filter from Semini Motors and installed it (Rs.3386/=)
Drove about 25km after engine-tune up and clearly feel quick and smooth acceleration than before.