Just saw your post, that makes sense. I could try to rig a MAP sensor off a boosted car and see if it will work.

Anyways got my engine pulled apart and #1 has way more carbon that 2 3 or 4. But the gasket was actually blown on #1 so idk if that has anything to do w the popping on idle.

Anyways here is a pic of the engine completely apart on the floor. And damn those are some big pistons I had no clue!

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