Very interesting. Might have to try that. I have the MP concepts upper grill which is very open. Still no resolution from Lund. Unfortunately just broke the 3-4 shift fork and car will probably be down rest of the year at this rate.
I am running into a similar issue as well with on/off throttle at low speeds. But I am Vortech supercharged. Surging/bucking for a second then goes away. Sent logs to Lund and was also told driver induced.