Check fuel pressure, you should have between 18 and 22 PSI at idle and between 28 and 32 PSI at 2000 RPM in neutral. If you don’t know how to check fuel pressure seek a mechanic that has the correct tools and know how. Too complicated to walk you through it.
Also check for boost leaks. Engine needs to be off ( not running). Using 15 psi of regulated compressed air and a build yourself boost checker which involves building with a four-inch PVC piece with end cap... drill and tap for air chuck in end cap. 4 inch silicone hose and two four-inch clamps.
You’re now going to clamp on your boost checker to the 4” air inlet of turbo. With regulated air put in a constant 15 psi of air and listen for leaks throughout the whole piping system & intercooler & going into the engine. You might be surprised you have some leaks.
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