So my idling/dying problem is definitely a timing issue and not spark-plug related?
Timing issue IMHO.
Is it still possible to bust a valve or would that have happened immediately upon the first start up?
If any, busted valve(s) is already done.
But you can dammage valve(s) & seat(s) further by using you car without fixing the timing problem since combustion could occurs while valves are not seated.
I would tow this car to the working place.
There are some differences with the older 1.6l engines and the one found in the Aveo. The Intake manifold, and engine management for one. As far as the 2.0/2.2l there are some differences in the block, and I dont know of any other US vehicles which used these engines except for the Nubria/Leganza/Malibu
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