Broken valve spring
Type your answer here... Burnt intake or exhaust valve, hole in piston, broken piston rings, bad head gasket, valve spring broken.
It is probably a broken valve spring.
could be a broken valve. or a loose spark plug..
A broken or maladjusted IAC valve.
A stuck lifter, a stuck rocker, a stuck valve, a messed-up cam drive timing and a valve impacting the piston head....
Sounds like the valves are not closing properly. Something in the valve train is damaged. Could be a bent or broken valve, broken valve spring, broken or bent rocker arm, bent push rod, etc. Low compression combined with back firing thru intake would indicate a damaged intake valve component and back firing thru the exhaust would indicate a damaged exhaust valve.
I have worked on many engines, I would guess broken valve. Check every cylinder with a pressure gauge. If zero broken valve, if all have good pressure, timing. If timing good, fuel. maybe flooding.
broken dccv... look for dual climate control valve in the answers...
The normal causes for a misfire would be Faulty: spark plug, spark plug wire, ignition coil, ignition module, fuel injector are the most common. Coolant leaking into a cylinder is another. Internal engine problems such as burnt valve, broken valve spring, bent push rod, worn rings
a broken rod or valve lifter
what causes broken vains in your face