Chevy Sliverado - Low power
 

Hello all First time poster,

I have a question regard my Chevy 2007 Classic 1500 5.3. I received "recharge power failure". Went through the steps and got a new alternator( under warranty) and a new battery. The message went away and the truck turns on, but on the first time I turned it on it felt sluggish. The RPMs would go low ; not to the point to die out but differently felt like it was going too. When I pressed on the gas the RPMs would go low and then studded back back. Any suggestions on what might be the issue?