Did you have the timing belt changed at 105,000 miles ?
These cars are better when they are not on the OEM tune. Get the car off of that.
Save your money and keep the car. Put some money aside for repairs.
At least you know what you got and not someone problem they sold...
175,000+ miles, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. Also CHECK YOUR OIL, these cars use it.