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I too have brand new 2012 Chev Suburban with rough idle. Dealer says "operating as designed" but admits to lots of complaints. Call me at 516 671 1295 Donald T. Rave, Jr.
engine rough at idle only?
is the check engine lamp on?
remove egr valve
start engine to blow out carbon
check egr to see if there is carbon holding the valve open
clean valve
reinstall retest
It's unlikely that the cam belt would cause rough idle!!
normally you would change the cambelt after so many miles Mine are always changed after 30k miles regardless. The mechanic was purley guessing.
If the idle is rough then it will be an electronic fault like air flow meter,EGR valve, Idle control unit. etc
go the cheapest route. replace fuel filter and add SEAFOAM to tank of premiun fuel. replace filter before 500 miles. then add SEAFOAM to gas every 3000 miles to keep lines.engine,fuel pump, and emissions systems clean, ETHANOL problem number 3000
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