Heys guys i just got my intercooled kb racing 70mm kit installed, im running 60lbs fiveomotorsports injectors, a 255lphr intake racetronix fuel pump, f-body fans, nelson performance fan harness and a nleson performance tune, the i started the truck up and let it idle for about ten minutes, idled fine, i startede down the road and started to lay into and as i was starting to spool it started to cut out, i headed back home and looked it over, i couldnt come up with any thing at a slow rev it will be alright but when i do a quick rev it starts cutting from around 3-4000 rpm, then i got a service engine soon light, nelson performance had told me i might get one and it would be a crankshaft position sensor and it just needed to be relearned, is this most likley my problem???? thanks for any input

 

Could be, need a scanner to pull the codes. Are you using any gauges to monitor your motor?

 

Most of the time if the crank learn is off bad it will set a code soon after programing. Sound like you need to check fuel pressure for one. Run check rpm when its pop or running bad to see if rpm's are all over the places.

 

I kinda had a issue similar it came down to wires.. may not be the issue though

 

Check codes for sure.

 

I agree, I have always found crank relearn codes to set immediately.

 

i hooked a small scan tool up and got p0174 which is a lean code, and i got p0154 which is o2 sensor circuit no activity detected (bank2 sensor1),

 

is that 02 sensor installed? And if so where at?

 

yea its installed, it was on the passenger bank, i switched o2 sensors around to see if i would get a code for bank 1, I started the truck let it warm up, took it to 5,500rpms slow let it return to idle and it acted fine, but when i mash on it my AFR is 10.5 to 1 on the wideband and it cuts out around 2,500 and really doesnt clear up till almost 4,000, after that the only codes i got were random cylinder miss fire (which i am assuming is from the rich mixture) and an 02 sensor heater relay code, I am starting to think my tune is way off because the is extremely rich

 

Replace that o2 sensor.