Just had this problem in my mechanical shop. Checked the whole injection system, changed numerous parts and also tried another ecm. Found out that it was a leak in the manifold intake gasket. We found out while spraying some brake cleaner and the engine would stop meaning there was a leak in the gasket. hopefullt it will solve your problem or give you a hint. P.S. Same problem also on some Mazda models.
What causes misfire 302, 304 and 306
the gun powder ispacked to tightly and the preassure builds up and can cause it to misfire
what are the possible causes of misfire on number one cylinder in a dodge 2003 ram 4.7 liter engine
Spark plugs
I'm not a mechanic / technician but I BELIEVE if the fuel injector is restricted so that the proper air - fuel mixture is not getting to an engine cylinder , that an engine cylinder misfire can occur ( that is only one of the causes of an engine cylinder misfire )
That would be that there isn't enough gas getting to them
Cylinder misfire. Possibly failed or failing engine mounts.
a bad wire or a bad coil to cylinder 5.
p0302 is cylinder 2 misfire, you need to fix the cause of the misfire. Possible causes are plugs, coils, injectors......
The causes for cylinder 2 to misfire in a 2001 Chrysler Sebring with a 3.0 engine is a faulty spark plug or a damaged spark plug wire. In-depth troubleshooting can be completed by a local mechanic or dealership.
P0302 is a cylinder number two misfire. Causes include spark plugs, injector, internal engine failure, etc.
What causes a misfire can be a number of things. But from what you are telling me, you may have water in your oil and maybe some bad gas inside your engine. If you have pumped in some bad gas, you may have a filed out the sparkplug at that #8 cylinder.