If you have it apart, change the chains and guides, and install a new style tensioner!
This is a nice kit but has the old style tensioner!

http://m.ebay.com/itm/200943624200?_mwBanner=1

This is a great kit , has the new style tensioner, see the hump on it!


https://www.ebay.ca/ulk/itm/152012410751

 

i totally agree about the coil pack.....good thing is that you'll be replacing all 4 coils at the same time. or, something as simple as a tank of bad gas......

 

My wife's HHR is running good again. It was either the loose timing chains or a dirty mass air flow sensor as I did both at the same time. My wife is happy and I can get back to my hot rod project. :-)

Thanks for all the info I got from the forum
Dave

 

Cool - if the wife ain't happy, the mechanic better get his hands dirty. Glad it is running right.

 

Very cool, happy wife , happy life!