Piston Slap: Bouncing Back or Sprung Out?

John writes:

You recommended to one writer that he consider replacing the springs on his car (as well as all other wear items in the suspension). Other then the obvious broken spring or the car sitting of the spring stops, when and how do you evaluate the need for springs? Do you recommend stock setting or performance springs for replacement?

Thanks, John (Jag, Kia, Miata, Chev)

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