Check your manual, for most cars it's every 3 months or 3,000 miles, whichever happens first.
5000 miles
ten thousand miles
If it is an automatic transmission every 30 thousand miles.
Chilton's manuals can often be accessed online through your local library's website.
A 95 Toyota Corolla engine that loses power when idling can have a number of different things wrong with it including clogged injectors, a dirty fuel filter, or fouled spark plugs. Performing a standard tune-up will often resolve this issue.
The best place to search for Toyota Corolla deals is with your local dealership. Often times, dealerships will have deals running, or you can look in your local paper for advertisements.
It should last the life of the engine and is normally replaced during an engine overhaul.
Toyota recommends every 5,000 miles but you could do it sooner if desired
Recommended at every 25,000-30,000 miles
Should be changed every 60,000 miles. This is NOT an interference engine.
If it has a replaceable filter I recommend every 75,000 miles.
Still depends in how often you change your oil. If say, in every 3k km then ordinary to semi will do.