Misfire after doing head gaskets and was not misfiring before

Question

I have a 2019 dodge ram 1500 with the 5.7 hemi, I replaced head gaskets because coolant was leaking from back of the head, inspected the head and block for warpage before installing and was good, also made sure my head gaskets were on the correct banks and not flipped upside down. Torqued heads and rocker arms to spec and correct sequence and Verified push pods were installed correctly. Did not mess with timing, nor did I pull the lifters out since I didn’t need too. When I went to start the vehicle it rough idles and eventually dies , I have to keep my foot on the gas pedal to stay on. Checked my DTCs and only code I have is p0300 multiple misfire, misfiring on 4,6,7,8. Checked for spark , fuel and compression and all checked out, even swapped coils , spark plugs, etc and misfire did not move. Verified push rods were moving and were not cockeyed. No weird noises from the engine. Load tested my wiring from pcm to injector and coil packs and had good voltage drop. Can not figure out why it is misfiring, any suggestions??

scottykilmer · Answer

So many things can go wrong. When you pull the heads and put them back together, it'll make your head spin. I would start by checking valve lash on the mall. See if something's wrong with the way it was put back together too tight or too loose