RE: Frusturating problem
It really DOES just DEPEND...lol....
I've learned the hard way that plugs that LOOK ok may NOT be ok.
At $5 a pop, its hard to just Throw 'em away though.
Now, if I am having a problem and I change a Plug......If changing the plug doesnt immediately solve the problem....I save it for later.
When I finally solve whatever problem I am having (and I ALWAYS solve the problem....Eventually, Lol!) I throw the old Plug in and see if it works....If not, I throw it away.