Car experts, i need your help regarding problem with my City Exis.
The problem is that when car got heat up its acceleration becomes really bad. I mean after driving almost 30 kilometers continously pickup becomes really bad. It hardly crosses 70-80 kmph with AC on (on petrol and cng both). Also the cng avg is very bad. Recently i have changed spark plugs and air filter and engine oil. Mechanics are unable to find the actual problem, jab bhi unke paas jata hoon ye kara lain wo kara lain etc but problem is still unsolved. One of my friend told me that tappets adjustment or bad plug wires could be the reason. Please help!