Originally Posted by CARNAG3

^I'm not running any cam gears or any modifications, its completely stock..I will have to get a light and time it tho. I changed the belt before installing it, but it runs too good to be off a full tooth.

It only studders at a constant throttle under 3k. If you give it anymore than 1/8th throttle it accels fine.

This is a weird issue.
I forgot to mention its throwing code 41 (o2 heater circuit)
Any ideas how to fix that? I have replaced the o2 with a new Denso, still same code and same studder.