The optra model has this complaint, I have been using the optra for the last 5 yrs and I used to have this problem of jumping, this is due to carbon and dirt deposits in the cylinder, one way of rectifying is to drive your optra at 140 kmph for an hour or so and this will get your pistons pumping and the cylinders will be cleaned automatically. This jumping problem will continue if your car is being driven below 80kmph. You may use chemicals also for cleaning the cylinders which the chevy service centre should be having.
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