Check intake manifold bolts to see if all are tight. As others mentioned could be intake gasket leak.
Here's another one. Pull #1 plug and manually find top dead center. Compare with where mark on harmonic balancer is. IIRC your motor is timed at zero degrees static advance. Timing could be set off based on mark being in wrong spot.
Had one once where the outer ring had walked about 20 degrees or so. Dealer couldn't find problem. It wasn't obvious that the outer ring had walked. This was on sister's vehicle.
It can be frustrating troubleshooting newer vehicles.
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