Several months ago I changed the spark plugs & wires on my '97 impreza outback 2.2.
Never really thought about gapping them... I have only really worked on diesels and didn't even know what gapping spark plugs was at the time.
Not sure if I put in pre-gapped plugs or not, but either way I don't want to mess anything up so I have two questions:
What is the spec for these? I got one of those little gap gauges but I don't really know what to do next.
-or-
Should I just go get a set of pre-gapped / fancier plugs? What's best for my car? When I got these I just walked into Napa and got whatever came up on the computer, cheap NGK's if I remember correctly..
Also, I should add that I have been getting slightly worse mileage, and minor missing when starting. Only other problem I know of is bad TPS sensor which I haven't replaced yet (do have the part though) which I was told will cause erractic idling and maybe bad mileage?
Thanks.