Might be ping too....
Try regane or an octane booster or hi-test gas. If rattle goes away, then you have a pinging problem.
If not, somethings loose.
"My Name is Richard. I am a Contouraholic."
1999 SE Sport Duratec ATX Spruce Green; Drop--In K&N Filter; VentShades;
Fog Lamp Fix Mod & PIAA510s with Bumper Braces & Stock Type aiming screw mod;
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AIWA CDC-MP3 HU; WeatherTech Mats
Viper 600ESP w/Remote entry
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