U need to use the software to set it all to 0 , I would just disconnect it u will need to reconnect the map sensor signal wire and ignition trigger wire
I'm not so sure your getting a true ready 17 on boost is crazy lean , turn fp up 3.5 with vac line on and try from there 11.5 on boost is a ball park , all ways tune from rich not a lean mixture
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That the problem with theses ecus there all mapped for different things and u have no idea what , I would never use one due to this 99% of the stuff said about them is made up
As for plugs bcr8es cheap as chips and they do the job well