why my car in low around 1000rpm not stable and the engine "semput",and at high rpm won't happen like this.i have change plug,but just can hold 2 months only after that start back again,
i just changed my car batt into the maintainance-free type 13 plates 70
before this i was using the normal car battery 13 plates 70
i noticed that the rpm drops more when i on my air cond after i changed my batt...