Hi everyone! I've got an issue with my 2008 Nissan Versa. It is a 6 speed manual with 140,000kms.

The problem I'm having is that the car jerks/slips (feels like the jerk that would happen when you shift poorly) while keeping a steady acceleration. It's happened before once in a blue moon but since yesterday it happens quite often. RPM stays the same, DOESN'T drop. Is this a traction issue, clutch issue or something else? It has been snowing since yesterday, though its happened before on a nice day where the pavement is dry, or at least looks dry. I do also find it does it more frequently is I have my heat/ac on a higher setting 2+, it also causes a lot of drag enough for me to feel the difference. Is this just a normal thing that happens with small cars?