I doubt its your timing belt, Should be throttle body related.
Was it costly?Could be a broken intake valve spring. It happened to me and threw a p2172 and p2171. Rough idle and dies immediately.
If the valve didn't drop down into the piston, then no it's not costly. You just need a valve spring and valve cover gaskets.Was it costly?
At the shop 3 weeks, no answerAny news on this?