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07 6.0L no power when cold, stumbles when hot
I bought this truck from a buddy with a little over 200k on it for what I thought was a good deal and I've been lurking on here.
When I bought it I knew that if you turned it off after getting it warm it would restart so I took it up to the dealer and had them fix the HPOP issue.
The dealer told me that it failed a cold start and needed the FICM replaced as well as the batteries but I declined. I took it up somewhere else and had the batteries checked, one was bad so I replaced it.
When I picked it up I immediately noticed that it wasn't running right. It was stumbling and wouldn't shift into gear and didn't have any power. After a few minutes it finally warmed up and was decent. Now even after it warms up it still feels like it's running worse.
I saw the FICM repair link on this site and resoddered all the connections. That seemed to help at first and then not at all. So I bought a replacement FICM from Northern Auto that was already replaced and after installation the same issue still exist, it runs a little better when it's cold at idle now but it still has no power and still shudders/stumbles when it warms up.
It seemed to run fine prior to taking it to the dealer and having the HPOP repaired...
Do you guys have any idea what my problem would be?
2007 Ford F-250