Causes for surging under throttle

[Arith2]

Once you get it working, you can use Testo to verify it's working correctly and returning the correct voltages.

I planned on just using INPA before starting the car and comparing to my ambient temp sensor. Testo works too and I'm probably going to be using it ALOT here in the near future.

[BubbaTree]

Dirty IACV, bad MAF, or vacuum leak would be the top suspects.

I very rarely get a surge around 2000 - 2500 under light throttle. Haven't yet seen a code related to these parts. Anyone get fault codes?

[liam821]

I very rarely get a surge around 2000 - 2500 under light throttle. Haven't yet seen a code related to these parts. Anyone get fault codes?

I never got a code when I had a vacuum leak, the oil drain on the bottom of the manifold fell off once, it just ran poorly under 3000 rpms.