grss429

got check engine light? or flashing check engine light?

did you have this problem previous motor?

Tazzfx

Not necessarily true. Especially if you are replacing an engine.

Especial86

iTrader: (1)

I'd have to agree that these motor mounts are built to last a lifetime and they are probably not the issue..

This issue sounds vague as mentioned, but I'd lean towards a misfire, or maybe a vacuum leak fir a quick guess.. More info and a better description of how it actually drives would help us help you OP...

Martian

exactly... not sure how the mechanic would know of a misfire without a scan or flashing CEL

cowboynatedog

Well this guy has been giving me different reason why my truck is not ready yet. And it's probably better if I took it to someone else. It's been at his shop for 3 weeks already.

Martian

yeah, you need someone who's familiar with the many quirks of the 5.4L 3V

screamineagle

Please clarify your theory....

Tazzfx

2004 and newer f150's (I believe up to 2008-2009) have many complaints of motor mounts broken or defective. There was even talk of a TSB regarding the motor mounts, although I had never taken the time to check. I'm sure you could read up on it yourself.

That being said, if one is removing an engine and putting a new one in, it would be foolish to think that a motor mount could not be compromised, seeing it is a fairly common problem and such an overhaul recommends new motor mounts to be installed.

Is that enough clarification or do I need to get real specific?

connorfx4

Get real specific. I don't know if I'd say it's a "fairly common problem" with this generation.

screamineagle

You definetly need to be more specific if your going to convince me that you have a clue as to what your saying. Unless your definition of "common" has a different meaning.