on a 93 mazda protege can you replace the piston rings without pulling the...

...whole engine? and also? why is my car idling lower in drive at a stop light than in neutral it runs about 600 rpms in drive and 1000 in neutral but it is a less rough idle in neutral.
yes it is a automatic and i was told that if you removed the oil pan you would have access to the piston rings
 
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