Engine Sputters over 4000 RPM - Datalog?

[Doc Vegas]

Guys: Just got my Gen II installed last weekend. Seemed to run well, but I just did a datalog and it sounds like it is missing over 4000 RPM (during no-load slow rev). I am sent it off to VMP, but curious if there is anything I should look for in the mean time. I am looking at the AFR on bank1 and bank2 and note that they are quite different. Maybe the exhaust note just sounds weird to me, that's possible! I just want to be safe.

Thanks

 

[Doc Vegas]

Never mind... BJ from VMP got back to me ALREADY! AMAZING FAST SERVICE! Thanks

 

[Racingsoul1977]

So what was wrong having same issues.

 

[1st usa car]

probably throttle body adjustment

 

[05mustangman]

I had this same issue when I had my engine built and whipple installed. Turned out that the spark plugs were not gapped properly. Also it appeared that someone took the atomizers off my injectors when they installed them. So once the injector and plug issues were taken care of, it fixed the sputtering issue.