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    Performance parts trip tps?

    I have a 2008 gmc envoy denali with a 5.3l and several aftermarket performance parts added. I just installed a jet power flow throttle body and an power aid throttle body spacer behind it. When I stomp the accelerator, it activates the decreased engine performance feature. Prior to this install...
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    Aftermarket headers

    So the 6.0L headers will fit the 5.3L 4wd envoy?
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    Aftermarket headers

    Does anyone have any recommendations for aftermarket headers? I've had custom exhaust installed on my 08 envoy denali 5.3L and was looking for a exact swap header manufacturer. I've heard that finding headers that swap with stock manifolds can prove to be quite the task?
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    Rough, bouncy ride

    After successfully installing the "t" I noticed that there was air coming out of a dry rotted spot on a shock, that not always leaks but most of time...any suggestions on how I could plug this leak until able to find permanent fix? The leak is barely visible when sprayed with soap water...
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    NEED HELP air suspension acting weird

    Is that "t" featured on that link the exact piece, dimensions and all, that I will need? Also, this may be a really dumb question but, how and where did you reinflate the shocks to proper height?
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    Rough, bouncy ride

    So I have a 2008 GMC envoy denali 5.3L with a few aftermarket mods and I am having issues with the rear suspension. It sags down to the tires in the rear when off at times, and other times it will be at proper height. When I shut it off, I usually hear an audible hiss, but if I start it up it...
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    Envoy 4.2 to 5.3 HEADER/EXHAUST

    I spoke with a man who has been doing custom exhaust for quite some time and is the Go yo man for custom exhaust and he Said if i were to get just any headers for the 5.3L they may Not fit due to limited Space... He Said he had Heard of one Guy having to Go directly to hooker and have them...
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    Envoy 4.2 to 5.3 HEADER/EXHAUST

    I was just made aware that headers and exhaust may turn Out to a major issue when putting a 5.3 into where a 4.2 was. I have a used 5.3 i pulled Out of a bravada i intend on putting into my envoy but was told that i may have trouble finding headers that will squeeze to fit? Does anyone have...
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    4.2L to 5.3L swap

    So we have the motor trying to look into it... Does drive train need to be altered in any way?
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    4.2L to 5.3L swap

    I just bought a used 5.3L engine that came out of a 2001 suburban and intend to drop it into my 2002 GMC envoy which currently has a 4.2L. This will be my first time doing a motor swap but will have assistance with the install. It has the wiring harness but no CPU... I heard I can "flash" the...
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    Super or turbo 4200? HORSEPOWER

    I guess I'm so stuck on this year and model because it's sentimental... It's a reincarnation of the one that saved my life in 2011 when involved in a headon collision with a tractor trailer
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    Super or turbo 4200? HORSEPOWER

    I joined this forum in order to attempt to obtain information on upgrading the horsepower, appearance, and performance of my 2002 GMC envoy. It is a reincartion of my previous, which went to he'll and back, enabling my survival of a head on collision with a 2011 freightliner... I want to really...

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