Hello all and thanks in advance for any help thatu can give, I have a 1994 cadillac deville 4.9 engine recently it started to backfire alot to the point that my muffler blew up i took it to a since then i change the cat converter, pipeline, new muffler, new coolant temp sensor, new intake air temp sensor, but it still backfires and stalls i took it back and got it diagnosed and these codes came up P052 P091 P039 P038 P047 P098 I033 I039 I052 I037 I034 AND NEED PCM OR PCM? PLEASE