Nissan Repair: Random Misfire/rough idle, vacuum hoses, nissan xterra

Question
I have a 2000 Nissan Xterra with V6.  Intake gaskets was seeping a tiny bit of Antifreeze.  Took it to a local shop and for repair, vehicle has around 75K so I asked them to go ahead and change timing belt. Now vehicle has a random misfire code, weak power, rough idle and check engine light.  Still at shop for 8 days now.  They have changed plugs, wires and re checked all their work.  I think timing may be off a notch(...but I am not the mechanic).  No loose wires, vacuum hoses etc.  Any ideas?
Thanks
Jeff

Answer
Jeff,

Bet you are right about the timing belt.  Have them remove the upper inspection covers and rotate it to top dead center and verify.  Also, have them check all hoses and make sure no plugs are cracked.  All it takes is one cracked plug and you will get a miss.  I have seen this many times.