For the first couple minutes of running it will accelerate nice and smooth. After the first couple minutes, it will accelerate with a very slight hesitation every second or so. My AFR doesn't seem too bad, stays around 14.6 to 15. I think the problem is visible in the O2 readings though. It will stay around 800-900ish then drop to under 100 for a fraction of a second, when I presume the hesitation is occurring. Also idle will jump in neutral if the car is warm. No codes.
Thought it was the O2 sensor but replaced that to no avail. Ideas?
Thanks
