Assalamualikum,
Bro, I need your help. I have brought a lancer 2005 1.3 petrol driven (no cng). In the morning even in hot days (I reside in karachi), the engine shows missing until the temperature reaches half. As the temperature rises, the missing also reduces. I have changed my plugs, replaced 1 coil, serviced the injectors but the problem solves only a bit. The mechanic says that the tapets need to be adjusted.
What is your advise? If I mix my fuel with hi-octane, will it solve the problem? Or the tapets will do?