Groaning induction sound on acceleration at lower rpms--2012 4.6

[mtrot]

Hi all,

My 2012 4.6 has developed a groaning, warbling induction sound upon acceleration at lower rpms. It seems like the engine is just bogging down a bit. If you get on it and the rpms go high, it runs like a scalded cat. I had installed a K&N air filter some time ago. So, thinking that it might be clogged, I just swapped back in the Hyundai air filter. But that didn't really improve it much. I also just added a bottle of STP Fuel Injector Cleaner to a full tank of gas. I'll see if that makes any difference.

Also, I did change the spark plugs fairly recently.

Any other ideas? I know there are other products that are supposed to clean the fuel delivery system, such as Techron and a Lucas product. Any recommendations? Thanks much.

 

[Gunkk]

Check drive shaft center bearing for wear.

 

[mtrot]

Check drive shaft center bearing for wear.

Thanks, I don't think that's the issue. The groaning/warbling sound is coming from the engine. After using most of the tank of gas with the STP Fuel Injector Treatment, it does seem like the groaning sound has abated a bit and the car having stronger acceleration. Does anybody have any other ideas?