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What year is the ride ? If it’s a 2013-14 I would have changed the ignition coils with the plugs . That year model of Frs Brz is known to have the coils go bad in the 70k mile range .
First start with out with putting OE PLUGS IN from dealer, nothing fancy . If they don’t fix it then start with the next part being the coils .
However,Since you are boosted look for any vacuum leaks possible around the pcv filter area where it connects to the block or check under the manifold areas that may have had a hose pop off . Check for leaks everywhere there is a hose aswell.
A bad vacuum leak can make the car run funny from the minute you start it or it can run fine and then runny funny when the boost or rpms are high .
If the plugs don’t fix it perhaps get smoke test done to look for leaks .
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