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Q: Check Engine Light and Reduced Power Light still comes on after tune up maint... on 2004 GMC Envoy

I've done a basic tune-up ,oil change,spark plugs,fuel filter,air filter,also changed the thermostat and cooling sensor @ a garage. Cleared the code. Ran ok for a day. Now both lights are on again! When I start vehicle up in the morning it warms up, then idles down greatly, reduced power light pops on and stays on..I turn it off and start it up again..same thing! When I put it in gear it crawls, then stalls..does this cycle over and over for about 30min. Need help with issue..
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