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Dan, Technician
Category: Ford
Satisfied Customers: 24164
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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I have a 2003 mustang gt 4.6 that is running rough an idle

Customer Question

hi. I have a 2003 mustang gt 4.6 that is running rough an idle seems low. I have readings from a scanner but not sure how to inter
pret them
Submitted: 2 years ago.
Category: Ford
Expert:  Dan replied 2 years ago.
Hello, my name is ***** ***** I'm here to help get your problem solved. Is the check engine light on? Does it seem to run fine other then the low idle?
Customer: replied 2 years ago.
check engine is on. throwing code p1150. car will occasionally stall at traffic light
Customer: replied 2 years ago.
obd readings show no misfires
Customer: replied 2 years ago.
the only other failure I can see seem to be evap related - initial tank vacuum. meter says no leak failure though
Customer: replied 2 years ago.
also a failure on vapor generation max absolute pressure
Expert:  Dan replied 2 years ago.
Does it seem to run better when cold?
Customer: replied 2 years ago.
Customer: replied 2 years ago.
just noticed..there is a pending code of p1151
Expert:  Dan replied 2 years ago.
Check the PCV hose for cracks, they are common to break causing this problem. Also replace PCV with one from dealership, let me know if that helps. Thanks.