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my 98 civic with 175k miles has an extreme heavy vibration at idle. in drive with the ac on, its worse and vibrates through the car. bought a set of new, aftermarket engine mounts from ebay and installed them and it made no difference what so ever. is there anything common with these cars.

 
Rep Power: 244

Did the mounts look worn/torn when you removed them? Cheap mounts can be just as bad as old worn ones.

 
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the 2 front outer mounts (right trans mount and left engine mount) were completely broken). the other 3 top left engine mount by timing cover, back engine mount and top trans mount weren't so bad. but it is like there is another issue. or yes they are cheap mounts. but has anyone else bought cheap ebay mounts and had the same issue only to buy Honda mounts and fix the issue.

 
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http://www.ebay.com/itm/251545451016?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

these are the ones I purchased. I will purchase oem ones and spend the money if I know that is the issue but not sure.

 
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have googled this issue and have come up with a few scenerios. first is the mounts need time to be broken in and the vibration may go away. highly doubt this but second scenario is the mounts need to be tightened in a sequence. has anyone done this?

 
Rep Power: 518

Every one who doesn't like the vibration!

Seriously, factory mounts are going to be the softest.

IF mounts were the original problem. Many other issues can cause a complaint like yours.
Called "neutralizing".

Read this http://honda-tech.com/honda-civic-2006-current-79/engine-vibration-stops-2447527/#post36669793