air intake is not preferred for all cars as its decrease the originality of the car just for sports purpose these parts are used not for family based cars.
i already told u to fix it by some mechanic become air to gas ratio is very sensitive now go to some computerized tunning center for fixing this problem.
@ jawad 501
if ur rpm is moving on still on both cng and gas get ur throtlle body cleaned.and if just on cng it means that ur cng is not well tuned get is tunned aur still per rpm on gas increase kra lain thora say inshallah masla theik ho jaey ga.and dont wash engine other wise the coils are disturbed get it blowed by air and clean it with a cotton cloth by some solution in bottle available in market for cleaning engines.
all the new era cars are not good for water washing engines.trend ban gaya hay k loog engine ko bhi wash kra daltay hain jaisay poorani cars ko dhootay thay.poorani cars main koi computerized electronic system nahin hota tha in all new cars there are computerized system alot of sensors ecu and many more.so just blow it by air and clean by some cotton cloth by some solutions avaliable in market for cleaning engines
every engine oil is good at its place at least its original.orignal are very rare now a days.few shops deal with original stuff.but the petrol pumps have orignal oil because un ki checking hoti hay.there are many oils in the market like castrol magnetic,zic,havoline and many more.i use to put shell yellow in my cars only from shell pumps.and change oil after its time limit like shell yellow after 4000km not check thickness or colour because there are metallic particles in the used oil which will damage ur engine and also evey time change oil filter because without oilfilter changing of oil is of no use and will damage ur rings of pistion and car will blow in morning then in the day.