408 LQ4 won?t idle

[whtphoenix88]

I have an LQ4 that I had built for as an NA engine. I am having a terrible time getting it to idle. It will run with throttle from 1400-2000 rpm. Then basically does nothing from 2000rpm+. Not sure where to start? Maf,SD,timing? I am running an ls3 top end with stock ls3 injectors using the tables I?ve found on this site and the f35cam from Texas Speed. The pcm is a stock 0411 ls1 fbody pcm with the stock tune so I figured with the updated injector data it would at least idle to some extent but I?m getting nothing.

[RDF1]

Posting your tune makes this much easier to help with.
But a 408 on a stock 346 tune is going to be very lean.

Do you have a Wideband? If no, then stop and dont do anything else till you get one in the car.

Also where did you get the LS3 injector data for the "411" pcm?

[SiriusC1024]

Proceed with posting the tune. The wideband can wait. Plenty of work can be done without it.