I have a 2000 sonoma 4.3 with 75000 miles it set for about 2 years i have replaced alot of parts and it ran very well for a while but just recently i have had a check engine light scan tool said co2 sensor rich in all banks i know that changing the o2 sensors wont necesarlly fix it because there are alot of things that can cause this problem. the first thing i noticed was my oil pressure dropping at idle very low almost 8 psi then it will come back i was wodering maybe the oil pan filter but the most recent problem is under heavy exceleration it will hesitate until 2000\2500 rpms then after that is fine under normal driving it operates fine i am curious if any one has dealt with this or has any ideas i am new to the forums

 

all these veiws and no comments

 

Sorry Sonoma
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This is most likely a mixture problem. Do you smell gas? Is it backfiring when this happens? Could be a bad TPS (Throttle Position Sensor) and flooding.