2007 Sierra 6.0 modified tunning problem?

[Tankdoc68]

I need some help if anyone can. I have a 2007 GMC Sierra, 6.0L, Comp cam, Long tube headers, LS2 intake w/ X-Link, high flow injectors, electronic exhaust cutout, Bully Dog programmer. Sometimes when I let off of the accelerator, like I'm coming to a stop, the engine idles down so low that it dies. Sometimes it will catch itself and return to a normal idle at around 850rpm. it seems to happen mainly when I let of the gas quickly. If I just casually slow down it has no problem. I thought about changing the TPS because if I watch real close, when I press the throttle down, the rpms drop before they go up. I do not have any engine codes. I don't know if I need a custom tune because of the mods and if that is the problem. Someone help please.

[Chris]

First off which body of 07? If an x-link is used im going to guess the 06 style.

 

2nd when stepping up to different cam and injectors like you did, you need to have custom tuning done. An out of the box won't cut it

 

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[Tankdoc68]

It is a '07 classic. Thanks. That's pretty much what I needed to know. I'll look for a shop that can tune it and go from there.

[Chris]

Black Bear Performance seems to be the preferred amonst the forum members, and the did my 6.0

 

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