The car recently started jerking when I take off. When I press the pedal it jerks as if its a manual and changing gears. Any ideas on what this could be? Oh and with the gas prices I had stop using Premium and started using regular gas. Could this have caused any issues?

Just keep pumping in the Premium fuel again and everything will be alright.

It happened to me before when I starter to use regular fuel. The engine jerked and had no power to move uphill.

Mercedes is a 'pampered' car. You need to feed her with good quality fuel.