do engineers have combos?

[Zaltiar]

Some combos are done using different skills from different classes, so it might be that you experienced a mix class combo. I myself am not too sure if there's a combo for engineers alone, there's one for commanders though.
There's a thread detailing all the different combos for the classes in sl, you might want to search around for that.

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[Kahlua]

I have seen backbreaker combo with other skills when I'm in groups.
Backbreaker, of course, being the skill that combos with Neutron stomp; the commando self-combo. I also believe it might combo with another commando skill, singularity I believe.