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I have an 02 envoy and it ran good until about 8 months ago or so... then the service engine soon light came on.. took it to the dealer and they said it was a cam phaser, they replaced that.. light was still on then it started loping at idle enough to make the headlights dim even took it back and they said it was the software... they updated it.. same thing, took it back they said it was the camshaft position sensor, they replaced it.. same problem.. it idles rough with a lope to it, when you start driving it, it doesn't have a lot of power at all... but seeing as this is my daily driver I can't just park it.. can anyone help me figure this out? the dealership has been no help and has just made it worse...
 

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i have no clue.
but have read several guys change out the cam phaser thingy- I think it gets dirty....
if one of the techs here doesnt answer- maybe try www.trailvoy.com
maybe one of those owners has seen something like it
 

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Clean the throttle body.
 

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did they change the solenoid that sticks out of the pass. side of the head near p/s pump or the actuator on the camshaft?I have had several of the inline engines with poor idle quality and cel on with cam actuators that arent returning to home position thus keeping the exhaust cam retarded.If they changed the actuator the bill would have been for around 4 or 5 hours labor plus parts.Thottle body could cause issues as well.
 
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