Yellllloooooowww everyone , im going to give you as much info as possible

(Problems, RPM boggs,O2 high voltage)

going uphill when my Automatic tranny shifts down, it hovers around 2,000 rpm and like drops down to 1800, then back up to 2,000 then drops down, then back up, I am assuming its a EGR or a mass airflow sensor

On my way to work 3 hours away, it got around -10 and i threw a O2 code P0144, so i left it cause its only an O2 code and then driving home i scanned the codes to get rid of them cause that light annoys the **** out of me, i saw a Mass airflow code, an O2 code, and another code wich i forget,

But here is all my info that i can recover,If any of this looks not right, lemmy know :]
DTCFRZF - P0144
Fuelsys1- CLOSED LOOP
Fuelsys2- CLOSED LOOP
LoadPCT- 3.1%
ECT- 90Deg C
ShrtFT1- 13.3%
LongFT1- 10.9%
ShrtFT2- 11.7%
LongFT2- 10.9%
MAP- 43 KPA
RPM- 589/MIN
VSS 0KPH
MAF- 5.6G/s
TP- 0.4%

 

P0144 is a problem with the oxygen sensor behind the converter, and it will not, (can not) affect engine performance.


The freeze frame data that you posted is pretty much useless, as it pertains to the oxygen sensor.


Freeze frame data for the MAF, and whatever other code, might be helpful.


In the meantime, follow the steps in this link, and post all 4 readings: https://blazerforum.com/forum/2nd-ge...eakdown-88305/