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My car vibrates at lot when Its in drive or reverse, but when it's in park or neutral the vibration is less but still unbearable. There is no check engine light on. I have had the car for 3 years.
I have replaced all the motor mounts, spark plugs, the flex pipe, mass air flow sensor, change trottle body. It still feels the same.
I was thinking to replace all the ignition coil, is that a good ideal?
What other possible cause can cause this vibration?
 

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1. Check oxygen sensors. Check fuel injectors. You could be running lean.
2. Check torque damper. Since you say you replaced it, see if an upgraded model from a 3rd party makes a difference.
 

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Is engine shaking a lot when doing this? Does it drive okay smooth throttle response smooth idle? Next if it is only in gear are transmission mounts all good? Maybe time to get it on a lift to give all mounts a good once over. Possible once trans is in gear and loaded it is torquing the trans mounts. In park look if engine is smooth then have buddy put it in gear see if engine is still smooth, not rocking or shaking. Heck it could be the trans torque converter shaking when engaged may need to try park and gear and watch trans for motion.
 
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