The emissions light on my 2005 gmc envoy came on went off and now has been on for about 2 weeks. The truck has 33,000 miles on it. I changed to a higher octane and that didnt help and its not the gas cap.
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1st, is the check engine light on?...How many miles on he vehicle? I would suspect the throttle position sensor (TPS) . Also, the mass air flow sensor (MAS)....Or,it could be you just need new spark plugs and, or, wires....
Could be many things. Take the vehicle to a place like Autozone. They will hook an OBDII reader up to your truck. This will read a specific code. Let us know what the code is, we can go from there. The code will start with Pxxxx
Sure sounds like a slipping transmission to me. When is the last time you changed the transmission fluid? Before you go dumping $2,600 for a new transmission, I'd do a transmission fluid change first. If you do change the fluid, use Dextron 6, it's GM's new transmission fluid, much better than the fluid you have now. Not to scare you, but my transmission went out at about 100k miles, so you're doing good if it hasn't been rebuilt yet.
I just bought a 2005 envoy too. I read in the manual that the 4.6 6 cyl engine needs 7 qts total. 2 Over the normal oil change. Is it possible it wasn't low to start? I noticed when Walmart changed the oil they charged extra for the change because it needed the two extra qts. However my dip stick has oil over the full mark. Seemed strange but I haven't had any leaks and after 3k mile no change in level. Make sure you had the correct about the first time.