I just got my timing belt done and new water pump installed since it is going on 68,000 miles I got the car back and it drives fine. But at idle it sounds like little misfires and i cant seem to figure out why. New plugs gaped properly and wires are fine. My boost gauge was at 17 before and now it is at 12-13. The motor is stock so nothing has changed. Can someone help me and let me know what you guys are getting at idle (vacuum) . Also hooked up my obd11 scanner and ignition at idle is around 5 to 8. Thanks for any help.

 

check hose clamps for boost leaks... you'd be surprised at how easy it is to miss one.