Howdy milespeed, I want to thank you for the great ideas of other possible sources of the problem. The one thing that I really need to know is where is the mass air sensor located; I do not want to pull the wrong one and create a new problem.
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We have 2 locations, upstream before the CAT, and dowstream below the CAT. The upstream is on the passenger side at the exaust manifold very easy to access from the top. The downstream one is after the cat, accessible from underneath. The connector for this one is a PIA, up near the top of the tranny. But doable if you're in the right position.
never use 4wd on dry pavement even just wet pavement can cause this. 4wd is for only snowy or slippery conditions
unless this is automatic 4wd or awd than u have a problem id suggest you find a forum for youre vehicle and post it there find one by googleing gmc envoy forums or chevy trailblazer forums as they are the same thing
loose/worn choke plate hinges worn/sticking choke plate seat sticking throttle linkage in need of lubrication leaking intake hose - causing hissing as air gets sucked in through the leak loose intake manifold body - check tightness of bolts
For more specific ideas: In 2006 GMC manufactured the Envoy in both 2WD and 4WD versions: with available engines: 6 Cylinders S 4.2L SFI DOHC 8 Cylinders M 5.3L SFI OHV
Fortunately the way they refine fuel these days and the way they engineer these cars and engines, the lowest grade is sufficient and will not cause any damage to the engine or void any warranties. So in short, 87 octane is just fine.