so to start off i blew rtwo motors in my 98 buick regal, i was tlod detentation, so the first time it happened my boost was getting up to 16-18 pounds when i had stock everthing, and when gettin on it, it would sound like it had a weird noise, as if it was restricted at a certain point, it would be like eng eng eng eng, in till i let of the gas,my buddy told me that my cat was plugged, it was. but allmost everyone says that would not make it do it. so now the 2nd motor did not make that sound, it just spun a bearing, had all the power no miss fires, but it went anyways. so now on my 3rd motor since april 08, its misfiring and its using gas like a *****, engines codes read as follows ( p0131 02 sensor ) and ( p0171 system to lean ) and
( p0300 random/ multiple cylinder misfire detected) and then
( p1404 manufacturer control auxiliary emissioon controls) then it repets the o2 sensor again so what to do any help?
