2004 mitsi colt engine vibration vibrates all the time now have checked mounts seem to be ok.

Check your transmission and engine mounts.

Had a vibration coming into a brand new car holden.Found when air con installed they didnt fit correct vibration would come up through instrument panel at 60 to 80kms when driving.Check firewall all ok there.All engine mounts are ok are they.Alternator doesnt have broken or missingbolts.I had brand new car crakshaft was split in to still running massive vibrations.I need history when this vibration came in what you may have done on car.Qualified mechanic 50 years

check the hanger and brackets for missing or broken/bent --also check the heat shield may be out of place --start up is when the engine shakes and vibrates the most --when idling it smooths out and the engine mounts take up the smaller vibrations

Has the vehicle not been at a repair shop for
a couple of days, so it can be driven & the issues
figured out

All your doing is telling us the place you went can't
diagnose a vehicle

That sadly, is what we try to respond to hundreds
of times a week

When a vehicle runs rough & vibrates, you can not
come on here & say a shop can't find anything wrong,
when you can

The vehicle has to be properly diagnosed

We can't guess & you won't understand any
solutions or be in a position to tell a shop how
to do their job

Engine mounts do not go bad in five miles. Sounds like you're treating a symptom and not the cause of a more serious issue. Are you sure all cylinders are firing correctly? That the severe knocking is not coming from your engine internals? Have you checked the steel around the engine mounting points for cracks or other damage? And just in case, if the mounts you are using are poly, are you lubing them before installation?

check for loose engine mounts(usually 15-19mm nut that tightens the rubber mount which dampens vibrations) located either side of engine block not sure if they are in engine bay or underneath near axles. check gearbox and Eng oil levels if everything seems to be ok it may be a gearbox problem and not completely engaging disengaging gear

Good call on the engine mounts, this problem has had a lot of TB owners scratching their head. Hope you used genuine GM mounts, aftermarket mounts tend to crush too much sending you back with the same problem you started with. With aftermarket mounts, the engine will not be as high as needed, the rubber isn't as stiff. Seen this many times. The other thing to check is you tranny mounts. Engine and tranny mounts are usually the culprit with vibration while in gear and stopped with TB's. What type of plugs did you install? Have you cleaned your throttle body?

motor mounts can be changed without pulling the motor the load percent change that the other guy posted is normal and a vaccum leak would cause the engine idle to wander when in neutral. if you need info on how to change mounts let me know

sounds more like a ujoint or a center support for the drive shaft. also check and make sure that the flywheel bolts have not come loose. also check the harmonic balancer and make sure it is not seperating

Replace balancer. You don't notice them until you rev it up.