Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum - View Single Post - 03 Envoy 4.2 Signfantly loses power uphill
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Old 07-27-2019, 05:16 PM
Monte27 Monte27 is offline
Junior Member
2003 GMC Envoy SLE
Fire Red 4.2L I6 4X4
Join Date: Jul 2019
Location: Big Island, Hawaii
Posts: 9
Well guys, heres where I'm at...Bypassed the cat... same problem. Someone told me the rubbish from the cat could have been plugging the muffller so I removed muffler and still ran the same. When parked I gradually take rpms up to 3k with no miss at any level, and it revs without bogging. On the road...slow acceleration, crawls on the up hill and motor sounds like its a 4 barrel with a big time boggin issue.
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