Dealer acknowledges the throttle body is sticking and will not cover it. They say the throttle body is around $200 and the total with tuning will be around $450. They state the throttle is electronic. Is this so? I have a stock 05 st and i see there is a throttle cable running to the TB. Is an after market throttle body worth it because if i have to replace it i want a better part. But if it does nothing or causes driveability issues i dont want it.