How to fix a tune up

If your asking how to do a tune-up, your owners manual should give you the mileage specs for inspection/replacing. Spark plugs--spark plug wires--air filter--fuel filter are part of a basic tune-up. Don't take any fuel lines loose without being sure there is no pressure on the system. Also, check for applicable trouble codes. To check for codes, yourself, at the least, you need an obd2 code reader. Your local autostore should have one. Some of the national brand autostores will check codes for free.

If you don't have an owners manual, I'll see if I can find one, you can look at online?

Try the link for owners manual.

http://www.gm.ca/gm/english/owner_centre/corporate/resources/manuals?makeName=Pontiac&modelName=Sunfire&modelYear=1999&method=modelYearChanged

Scroll down the page to sunfire pdf. Click