My Corolla XLI 2012 gives strong Engine vibrations due to Low RPM when clutch is pressed to change gears during motion. This happens at random intervals and with AC ON. This has been happening for couple of months. It is driven 83000 Km and always serviced at Toyota dealership. The Toyota workshop changed plugs, air filter, oil+filter, performed tuning and throttle Body Service, checked AC, checked oxygen sensor, checked engine mounts but could not find anything wrong. I have tried Hi-Octane and driven hard to clear any fuel clogs but no improvement. Toyota is clueless about this fault. Any advice from Pakwheels members would be welcome.