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If I get into boost sorta fast the engine will cut at 5k rpm. If I slowly get into it it'll let me pass 5k without cutting but won't go over 5psi and  also after 5k it'll die sometimes or bog. My shop has checked about everything and they can't find the problem. They told me the only thing I can do now is to run a standalone ECU. I'm fine with that but kinda worried about not being able to run a closed loop so it doesn't waste gas. Any input ? Very much appreciated 

 

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When did the problem start? Or has it been like that since the swap?
I would start cheap and easy. Such as check for boost leaks, clean coilpacks, new sparkplugs gapped to 0.8, change fuel filter.
The stock ecu should be fine at 8 psi, it shouldn't have any R&R issues. If you have a boost controller you could just quickly bypass it and run stock wastegate pressure to see if it fixes the problem at all.

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