My engine was replaced about 5 months ago. My check engine light has been blinkin ever since. It has a multiple random misfire code and a misfire that is not always even noticeable until recently.. It's getting worse. Everything is new.. Plugs wires cap rotor fuel injectors ( spider) fuel pump fuel filter.. Any ideas? It also like makes a pushing motion (surging) as it goes down the rd. thanks any help appreciated.