Valve clearance adjusted, now idle is high

[kongjie]

Since I picked up my '06 with only 700 miles on it, when I was getting new tires put on it I had the valve clearance checked since it might not have been done at the 600 mile interval.

After I picked it up, the engine felt like it was running a little smoother than before. But as the engine warmed up, the idle got pretty high. Without a tach I can't really say where it is, but I'm pretty sure it's too high. Also, when I turned off the engine (once when filling up, once back at home), it backfired.

It kind of feels like the choke is still engaged, but do you think it is just a matter of turning down the idle?