It could be a few different things, like the ECT(engine coolant temp) sensor, or EGR not operating properly, O2 sensors (as mentioned by Capri306), ...You have to get the codes. Did they do a engine running test as well? or just the KOEO (key Off, Engine Off) test?
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons 
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542
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