Hemi chugging and stalling

[daniel van fossen]

Hdy all, back again lol. My 05 hemi has been acting up where it will stutter and chug and if i dont let off the acc pedal it stalls. I hooked up my code reader and it said catalyst system deficiency bank 1. I did have big exh manifold leaks so i fixed that. Ran great for couple days now back to chugging and stalling unless i slowly use the acc pedal. Back o2 sensor i can only read in voltage. But it seems to be bouncing all over like the front o2 sensor and I've read here it shouldnt. Could def use ideas. Thanks!

 

[daniel van fossen]

Update: when its about to stall out both my stft1&2 banks run up to almost 30% then if i let off before it dies they go negative for a min then slowly come back.

 

[jws123]

Check the usual stuff fuel pressure? could be a pump going bad whens last time plugs where done ect.