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Compression specs are tricky as gauges and techniques change actual values. The important thing is that there be no more than 10% difference from cylinder to cylinder.
The running at idle could be motor mounts or a performance problem. If you didn't have it before you might have them check into it. With all they did it should work as new.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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