I attached four photos of my successful scan to see if any of you can read why I got a P0174 and I feel the engine missing intermittantly.

I am also hearing a knock or slight tick in the valve train. Related?

I recently had new coils, plugs, gasket, VVT phasers, chains and tensions installed.

All wise counsel welcome!

 

If you see other problems in the scan data, don't be shy, too, of course.

 

I would first make sure your MAF is clean. Next check the bellows of your intake tube to make sure there’s no cracks all the way around it. If that all checks out, pull the bank 2 top cover where it covers the fuel injectors. When the engine is cold, start the engine and spray brake cleaner where the intake manifold meets the cylinder head. You want to listen for changes in engine rpm’s. If it changes considerably, you have intake manifold gaskets that have shrunk and need replaced. If it doesn’t change, follow the brake vacuum booster tube where it goes under the throttle body on bank 1. That is another known vacuum leak area and spray brake cleaner on it while it’s running and listen for the rpm changes. If changes, that needs to be addressed.