I had a maf code so I a new maf in and now having instant p0400 codepopping up. P0243 also pops up but not as much. Ii swapped transduders and no change. Is there any ways to test the vaccume points. What would trigger these 2 codes at the same time?

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero