I just purchase a 06 Monte carlo and have a problem I can't figure out when I getting some speed starts to missing but I push the gas pedal deeper and goes away, I replace spark plug the cables and one coil I replaced the cat I I put some treatment in the gas rank and no luck but the funny part about it is that only does it on d when I sift it to 3 goes away then my idling its to low have any one gone through this problem before?, thanks for your help

 

Maybe you need to replace the fuel filter, while you are at it the air filter might be needing replaced as well.

 

ya bro I just did it today and didn’t help I test the fuel pump pressure. And is good.

 

If you believe it's missing the easiest and cheapest route is to scan the computer for miss-fire information and see which cylinder is the issue. To me it sounds like a coil failing. I had similar issue only under acceleration . Good luck