If the air filter is getting plugged with dust and debris, the air-gas mixture is going to be off, causing poor power and a rough-running motor.
If the air filter is torn in some way, dust and grit can get into the engine, resulting in greatly increased motor wear.
Bad PCV valve.
No
There are lots of things that can cause that. Bad gas, dirty fuel filter, dirty air filter, and a number of other things can cause it.
No
No. A dirty cabin air filter would restrict the air flow from the heating, air conditioning and ventilation systems.
If by breather you mean the air filter......yes.
bad ign coil bad plugs bad wires bad fuel filter bad air filter bad cylinder or head (do a compression test)
pcv is bad.
A bad air filter can cause black smoke or bad fuel injector and maf,tp sensor
1. A bad or weak blower motor. 2. A bad or restricted air filter. 3. A leak in the duct work...............
wrong oil filter , bad oil filter gasket
Oil in an air filter is commonly caused by a bad PCV filter. Check the filter, and replace as needed.