That sucks, and this is exactly the reason I do all of those items myself!
Sucks when that many things are replaced at the same time, too. Makes it harder to track down what the issue is. I'd take it right back to them and have them check timing, etc. . . . . until you're satisfied with it.
Once, long ago, I had a garage put new plugs on mine. It ran really crappy afterwards, and I wouldn't leave the shop until they fixed it. They found after about an hour of searching that the "mechanic" had bumped one of the plugs and closed the gap on it!
Good luck!
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