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From the internet search. This is on the back side of the engine. Crankshaft position sensor is near the oil filter. Camshaft position sensor is straight above.
It could be the air filter but I would first suspect the fuel filter. If it has been awhile since your last tuneup I would suggest doing one - including filters,oil, cap / rotor, wires and plugs. You're on the right track with your thinking - good luck!!
If it has a big black plastic bolt head and cover at front middle of car on engine then remove that cover. To make removal easier take off air filter inlet tube and move the wires close to cover. The filter snaps into cover so you should be able to pull it right off.
I fix my own 1998 cavalier. before I had the same problem. mechanics made me changed catalyte converter, combustion gaskets, EGR, fuel injectors with a tune up on spark plugs and boots... BUT the problem was still there. they all gave up and told me to trash the dang thing but I kept it. did research and studies, lots. finally found out the car was design without a regular pcv valve.
**There is a thing called an air/oil separator on it. Its mounted on the block of the engine just right above of the oil filter. You must clean out the tubes. The one that usually gets clogged by oil slug would be the one connected to the oil. runs smooth like a baby after you get that clean. hope this helps.
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