could be as simple as burnt spark plugs i would think it would run worse with a burnt piston but if its not smoking or anything the pistons should be fine so i would start with the plugs
Check wikipedia on this sounds like a problem these cars have, that I read about on there.
antifreeze is most common problem related to petrol engines misfiring. this can be cured by replacing the timing belt in addition to the thermostat and coolant temperature sensor. this will remedy 95% of misfire problems on most modern cars.
Your Subaru is misfiring when it reaches 1 bar because it has a mechanical problem.
When the engine is cold or when it is misfiring.
It depends on the reason that cylinder is misfiring. It could cause serious damage to the catalytic converter.
Timing belt. misfiring engine
A sparkplug misfiring.
If you had an EGR problem, the car would be stalling at idle or it be pinging at speed. Check the spark plugs, spark plug wires or distributor cap. The car sounds like it's misfiring. It will idle fine, but under load the problem shows up.
Lots of things. From misfiring spark plugs to incorrect timing to deposit build up.
Have vehicle scanned to determine problem
When a car is misfiring it is most likely the spark plug or spark plug wires instead of a fuel pump.
2008 malibu 3.6 L code says PO302 misfiring Misfiring in number 2 cylinder. Could be an ignition problem with a bad spark plug or spark plug wire. Could also be a bad fuel injector. Could also be a mechanical problem such as a bad valve. Start with new plugs and wires.