get your valve tappet clearances checked. secondly ask them to check the settings of ECU by using tech2. thirdly ask them to check the timing in front of you. they will show you a white flashing light which has to match perfectly with the marking near the pulley of the alternator.
at the last one sincere advice. stop using premium fuel for low compression engine like alto. i have suffered a lot due to this which i have discussed in other threads. stick to normal unleaded fuel only from a good reputed fuel station.
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