Do you know what is the problem

I'm using low-viscosity oil in my car (Mazda 323 Hatchback 1994 1.6 Liter engine) (Mobil 1 oil). Suggest complete oil change, new high capacity oil filter. Maybe use something to boost compression in your engine. I am using a ceramic solution which supposedly improves the inner surface of the cylinders and improves compression. These are low-power engines anyway though. So, I think you need oil change, possibly improved spark plugs, or at least spark plug cleaning, if one or more cylinders is not firing as well as the others, that would mess up the engine I think. Maybe your fuel filter needs replacing like mine supposedly does. Your air filter is clogged also. Maybe a high flow air filter. I have K&N and for these you are supposed to add a certain type of K&N air filter oil when you first install it.

Yes also for cars made in 1999 I think all of them are covered by the IBD-II computer scanners, so that should tell you right away exactly any and all problems. I cannot do this on my 1994 car although I would like to. I don't know how to read the alert codes on my car yet. I should get that done. I know this thing has an onboard computer but havent accessed the info yet.

Actually now that I think about it a bit more, it sounds like your automatic transmission fluid is overfilled. Check this. Also check to make sure the oil is not overfilled. That could send you back to the horse and buggy era quite fast.