ok guys first stats
2003 monte carlo L67 swap
slp headers
3.4 pulley
autolite 104
3 inch down pipe
high flow cat
dynomax cat back

ok so my car has bad light throttle response when in 4th gear or very light throttle I've changed o2 sensor twice with autozone and kragen brand sensors everybody tells me 2 go denso but im not sure, anyone run into this?

 

Get an AC Delco sensor... cuz that's the code for a bad manifold O2...

 

but both of the ones i have replaced are new, are they just crappy o2's and ac delco is better?

 

Get a Denso or Bosch

 

DO NOT get a Bosch. Haven't seen a good one yet.

 

ACDelco is stock OEM, and I have better luck with them than any other.

 

ok im going with ac delco but i have a high flow cat wink wink I'm from cali and had the computer tuned @ intense i heard if you flow to much through the exhaust it will throw that code, will that cause my issue? or am i full of it?

 

I think a high flow cat can throw a code for the cat (I think it's P0420)