Pick up a can of Seafoam engine cleaner and dump it in the gas tank. Ask the guy at the auto parts store.
You can unplug the battery cable for a few minutes, that will reset the ECU.
Didn't notice where your from, There are a few Tuners on this site that can help you with Cabb AP. Talk with one of them, before you spend your money. I'm meeting my Tuner at 4:15 today so he can load his map into my new Cobb AP as a Base map.
The AP can also read codes and clear them. You could have bought your Scanner from Sears instead of ordering it. Or just put that money towards the Cobb AP.
miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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