Needing some help, Random misfire started, the other day very bad too, Have pulled cam sensors they r clean, replaced upstream o2 sensor, no fix, feel like timing may be issue. Is there a way to check the timing? Also wondering if fuel pump issue, but it is running so rich u can small gas from exhaust. So not sure that is issue.
Obd2 codes are 2096, 0421, 0139, 0171, 0300
Any help would be greatly appreciated.
Thx Roger