i would have to agree on it being the balancer. Not too difficult to check and fix yourself, if you research what the proper alignments are. (what mark lines up with what) its just time consuming if you take the fan, shaft, timing cover, and all that mess off.
The Oil pump shaft and the Drivers side balance shaft are the same thing, all one assy. There is a specific procedure for aligning the balance shafts, if the guy who did it doesn't usually do mitsu's they likely messed up.
see section 11C-28 in the engine manual here.
http://mmeierle.com/images/Max/1G%20...2%20ENGINE.pdf
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