When you say ... you've tried premium mobil fuel. Does that mean that you typically don't run Mobil or don't run premium?
If you answer that you don't run premium, the issue is between the seat and steering wheel. Likely you hurt the motor.
If no to the above, then change the plugs and wires. You are probably running some crappy plugs like Bosch platinums that get destroyed in our waste spark environment.
I'm changing your title... Cause you don't need a mechanic to solve this one. Likely it's straight forward enough thatmy 17 year old neighbor could solve it in ...HER sleep.
