04 sunfire 2.2 low idle problem with knock

working on an 04 sunfire that has a low idle isue and a knock under the rocker cover... i have already replaced iac and redid timing chain and gears, tensioners ect.... if any one has had a simmilar problem i would like to hear about it.... mayby it will help me figure this out.....

thanks rklementi

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Vacuum leak would be another cause for low idle.

As for knock...

Is it an actual code being thrown or what? If there is noise, where is it exactly coming from?