Please describe "loose valve", not sure what you mean.
It could cause a low rpm misfire/stumble/die off.
If the valves were adjusted incorrectly, yes it can cause a miss. It can also burn a valve if they are adjusted too tightly.
Someone can miss fire if they have very bad aim plug fouling out (dirty) bad spark plug wire (short)
No , but lean conditions can cause the misfire
Replace the valve cover gasket.
It could be a bad sparks plug or timing belt which would make it miss fire.If you do not have fire to the proper place in the engine, it will cause a miss fire due to the firing system of the engine.
a stuck valve or bad plug or plug wire, or bad cap and rotor to include a cracked or missing vacum hose will make any engine miss.
i would like to know what would cause the miss firing in Chevy Malibu
Bad spark plug?Bad plug wire?Bad valve?Bad piston? If plug or wire not defective do a compression check to determine whether problem is internal
Check your vacum lines. The rubber and plastic hoses under the hood. If one is loose and leaking, it will cause a miss. If it only does it at idle, it will probably be a small line or just loose. that's the first and cheapest thing to do.
EGR VALVE IS LOCATED NEXT TO THE TOP RADIATOR HOSE AT THE ENGINE, IT CAN CAUSE ENGINE TO MISS, STALL AND SURGE.
Pinging louder during first few seconds when started is normal for this engine. if the valve is sticking you should have a bad miss fire and the car would run ruff if the car runs smooth still it's a rod