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TIBURON(GK) > 2003 > G 2.7 V6 DOHC > Emission Control System > General Information > TROUBLESHOOTING Symptom Probable cause Remedy Engine will not start or hard to Vacuum hose disconnected or damaged Repair or replace Malfunction of the EVAP Canister Purge Repair or replace Rough idle or engine stalls Vacuum hose disconnected or damaged Repair or replace Malfunction of the PCV valve Replace Malfunction of the evaporative emission Check the system; if there is a Excessive oil consumption Positive crankcase ventilation line clogged Check positive crankcase |