Protune has two user modes, basic and advanced. It starts up in basic which only allows you to read data from the ECU and delete fault codes.
In advanced mode you can access live running data and, if you have an unlocked ECU, make changes to pretty much all of the parameters.
So if you stay in basic mode you won't be able to screw anything up.
Before you go down the Protune route check the fuel pressure which should be 58psi. There is a Schrader (tyre type) valve behind the right hand cylinder and you can get cheap fuel pressure gauges off Amazon/eBay etc. Check it's 58psi when you turn the ignition on then start the engine and run it for a about a minute or so and check the pressure stays at 58. If it drops at all then you need a new fuel pump and the best bet is to go for the Walpro upgrade.
