Oil is coming from pcv or breather pipe. You probably have excessive piston ring wear causing blowby and forcing combustion gasses up the engine and into the breather and pcv system. Oil will come with the gasses if not filtered out. Check the pcv valve for proper operation and check any breather cap for baffles to keep the oil in the valve covers. Also consider getting an engine rebuild, if you want to keep the car.
SOURCE: having problems with my 96 chevy tahoe mass air flow
The MAF (Mass Air Flow) sensor is a very common problem with these along with the pickups. This isn't what you would call an inexpensive part. Definitely do some shopping before you buy one.
SOURCE: Mass Airflow Sensor 2005 Chevy Malibu. 2.2 ltr.4 cyl.
The MAF is in the flex hose that delivers air to the engine, it has a 5 or 6 wire connector going to it.
SOURCE: 99 Chevy Malibu - auto trans - no dipstick
You have what is called a closed cased transmission. You have to crawl underneathe to get to the tranny and remove the upper bolt close to the side of the case (more towards the bottom of the transmission). When you fill it, you fill it till it starts to drip out of that hole.
Looking for a picture for you.
SOURCE: looking to findthe mass air flow sensor on a 89 chevy corsica
location is under the hood where the aircleaner is there is an electrical connection that plugs into the mass air flow sensor
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