Engine vibrates/shudders when hitting boost

[ovo_e30]

I recently had an issue with my turbo m20. Whenever the boost gauge crosses from vacuum into boost (under load) it shakes the engine/car pretty harshly. If I accelerate smoothly at 30-40% throttle through the entire RPM gauge (in vacuum) no issues, however, the second it crosses atmospheric and goes into boost even slightly, the engine vibrates.

This happened after I replaced my C191 connector (fuel injector connector). I checked my TB, BOV, and all vacuum lines that I removed to get to the harness. Nothing looked ‘off’. I replaced my spark plugs with a fresh pair thinking it was an ignition issue, but nothing changed the symptoms. My car does idle smoother though :)

Any ideas guys. I’m kinda lost with what else it could be. Clutch maybe?

[atmh]

Driveshaft center bearing maybe? That tends to vibrate/shudder/knock, usually only when the engine is under load (accelerating from a stop, etc.) Doesn't have to necessarily only be under boost, but I bet it would show up first under boost.

Is it worse in first gear? or does it not really matter?

[ovo_e30]

The gear doesn’t matter. It’ll happen in all of them if the engine goes into boost.

[ADEN]

Log your ecu you may need tuning or your map sensor is acting.