I think its something else. Happens to my 800dx (almost same thing as alto lx).
I can't really explain why.. but its normal for this engine to jolt at a particular rpm with a/c on.
Let me tell you the symptom I face..
--going in 2nd gear.. at say about 25km/h.. the moment you release the accelerator even a slight bit .. strong engine braking kicks in.. giving you the jerk.
Its very annoying but.. can't be helped! .. Maruti has put in all it had in this engine!!.. don't ask them for more.
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