Will not start after valve cover replacement

Hello,

You might have a major vacuum leak here. Did you make sure to plug your Positive Crankcase Ventilation (PCV) back into the valve cover? Also double check that any electrical connectors that you might have unplugged to get the valve covers off are all re-plugged back in. Here is a link below showing you how to replace your valve cover gasket:

https://www.2carpros.com/articles/replace-valve-cover-gasket

Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros