I have a 2004 6.0 with 185K. I have rough starts in the morning and low power until it warms up along time. wont pull up the driveway. Main problem is at highway speeds. when i let up on accelerator, it starts to shake and viberate. I can gas it and it stops, but when i let up on the accelerator it starts shaking again.

I checked the codes and have the followingO261, PO264, PO267, PO270, PO276, PO279 and PO282.

I have had the FCIM replaced by the dealer once at a high price. I have seen a website curcuitboardsmedic.com for $380. If the FICM is bad, can you reccomend these guys? Also, can you tell me how to test the FICM?

Thanks

 

responded to your thread over on the nation. the sticky at the top of the page has the FICM test procedures. And check out the price at FICMrepair.com. perfect customer service and good turn around time at a fair price. Or see if Mdub can get you one out.

 

Thanks again......I will be testing it when I get an assistant and will reply with the results on all posts.

 

Let us know what you find, definitely test it. Might be worth having your batteries load tested as well. Amazing how poorly they'll run on weak batteries.