2002 chev blazer, I don't hear this noise when idleing but when I hit the gas it sounds like something is jumping around in the intake!? It sounds like a piece of plastic. Any guesses? Thanx, A.

 

i read in another thread a while ago about someone changing their air filter and forgetting to take off some sort of metal strip on the filter and it got sucked into the intake and was making a noise. so next question did you just replace the filter?

 

I have a k&n and I did just clean it but it wasn't the first time I've cleaned it. But thanx for the imput.

 

i had the same thing happening on mine. it turned out my pcv valve was making all the noise, the grommet was cracked letting it suck enough air to rattle