I bought a 07 xxx just has 113k on it very nice car but has a misfire and giving several codes really hope and would appreciate any help it's giving a p0304,p0134,p0031,p0107 and p0098 codes I've replaced the mass air flow sensor I'm afraid the ecm is fried bought it at auction and think they pressure washed engine before bringing it any help would be greatly appreciated thanks

 

P0304 Cylinder No.4 misfire detected.

P0134 A/F sensor no activity detected - Upstream air fuel sensor ( Pre Cat ), not the 02 sensor ( Post CAT )

P0107 MAP sensor circuit low input ( Not MAF/ Airflow sensor )

P0098 Boost air temperature sensor circuit high

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They all have PCM has a possible cause, not necessarily linked.