I have a 1990 Grand Prix with a 3.1 v6 no turbo and I need a firing order diagram and to know the spark plug gap. If anyone can help me out thanks.
autozone dot com lists vehicle repair manuals, you can find everything there.
it should all be on the emissions sticker, plug gap and coilpack arrangement...
emissions sticker, haynes manual, etc.
buy a good manual and you will have all the answers you will need.