p0101 first then p0300 then o2 senser that came up because on the first day i cut the pipe infront uf the cat that has not come back on since i weld it back to gether tonite

 

Did you clear the codes and drive it after welding the pipe?

 

yes codes were cleared

 

ok. Does your scan tool allow you to view fuel trim? Should be a menu showing "Short term fuel trim" and "Long term fuel trim" or possibly STFTB1, STFTB2, LTFTB1 & LTFTB2.

 

no this one does not

 

P0101 is a mass air flow sensor or circuit problem. Any chance you have a K&N air filter on it? If so, the oil on the filter may have contaminated the elements in the MAF sensor. Whether you do or don't have a K&N filter, remove the sensor and clean the elements with brake clean spray, (it leaves no residue). Be very careful not to disturb the elements, they are very fragile.

 

i see on here people talking about spark plugs when i changed my plugs they were out of ac delcos so they gave me bocsh
and no k&n filter

 

going to the parts store to get correct plugs and brake cleaner

 

AC Delco 41-993 with a gap of .060"

 

Pulled plugs to replace and cylinders 1 3 5 hav e oil on them