Dreaded P0171

[TRIFECTA]

Hello everyone,
I’m seriously struggling to figure out what’s wrong with my car. It’s got a P0171 with long term fuel trims peaking into the mid +30s. I’ve checked the purge system, PCV system, replaced the MAF sensor, smoked the intake and had no leaks at all, O2 sensors appear to operate normally.
What’s even weirder is that they’ll spike to around 30 when I come to a stop and slowly start to drop back down into the teens. It does this every time and hits mid 20s in between shifts. Any ideas?

Hey there!

Please send us a diagnostic log if you haven't already. There's no guarantee we will see anything in the data that would help, but we'd be happy to do what we can!

 

[Gotta_Go_Fast]

Hey there!

Please send us a diagnostic log if you haven't already. There's no guarantee we will see anything in the data that would help, but we'd be happy to do what we can!

Hey Trifecta! Y’all are always an awesome help. I’ve been talking to you guys for awhile now. It’s much appreciated