The symptoms may vary from Saturn to Saturn but can produce some of the symptoms you are experienceing (bad mileage, poor running). The original was made of nylon i believe and they do indeed fail and/or cause problems. You need to buy a brass tipped one for about 20 bucks from an OEM dealer/factory (
www.saturnparts.net is a good place). 6 mm deep well socket wrench is needed, do not overtighten. Can't remember the torque specs.
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1998 Chevrolet Blazer LT (95% stock)
Pioneer AVH-P7500 DVD receiver
12" Alpine Type-R in a sealed box
PIAA Super Plasmas GT-X bulbs
PIAA Xtreme White bulbs
K & N drop-in filter

"Melo" and "AI". Enough said.