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Also use your old scan tool to see if the engine vacuum is good if its low or erratic suspect a leaking EGR valve

Does it run rough during a cold start. Suspect a internal leak with the EGR VALVE. Replace it with a genuine Motorcraft brand.

I had the same issue on a 2004 ls v6 turned out to be a leaking EGR Valve, i was getting random misfire codes lean/rich O2 codes. I had just replaced the EGR with a standard motor part, I switch to a Motorcraft, Problem solved, never buy aftermarket if u can avoid it. Thanks

Does it run rough when its very cold. I would most likely suspect a faulty E G R valve not fully closing when cold.trust me I have fixed myself every issue I could myself on the ls v 6. I know this car more than most. I have done injectors tune up lower gaskets. U name it. With my own hands.

Does it run rough when its very cold. I would most likely suspect a faulty eve valve not fully closing when cold.trust me I have fixed myself every issue I could myself on the ls v 6. I know this car more than most.

V 6 or v 8 . I had a 04 v 6 it ended up being a faulty aftermarket E G R Valve. Motorcraft only bro.

V 6 or v 8 . I had a 04 v 6 it ended up being a faulty aftermarket E G R Valve. Motorcraft only bro.

I had the same issue in the past with a 04 la v 6 no codes or anything. Ran like a dog when cold. Replaced EGR Valve with a Motorcraft brand. Ran great. It would rob like crap on very cold mornings 25 degrees or colder

EGR Valve leaking. Runs fine when warm right.

I would suspect a bad EGR Valve.

Don't feel bad bro I was hit while stopped behind the dump truck in the pics. The car that hit me was a Cry 300. man it was a hard hit. I broke the DS seat belt. Hopefully the insurance co Gieco will total the car. i would not feel safe driving it. I do have to admit the LS is one darn tough...