Just throwing this out, but since you mentioned you notice it when it's not in gear. Have you checked your motor mounts? You might have a bad one.
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Eric - 89 Mustang LX coupe
5 speed 302-Cobra Intake-GT40p heads-TFS stage 1 cam-FRPP 1.6 roller rockers-3:73 gears-KYB shocks and struts-Eibach Pro-kit-HPM Mega-bite upper and lower control arms-FRPP aluminum driveshaft-16x8 Chrome Cobra Rs
R.H.C. #14
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