Rough running with updated FICM

[apeelectric]

I was having the same trouble with an 2005 with PHPs tuned FICM put stock one back in now the truck is running fine I think there must be a programming problem I will try to call PHP to get info. Also my truck did not shift right after installing new FICM Bill said it should have nothing to do with FICM but with stock FICM all my troubles went away .

[Power Hungry]

I am still confused as to why the FICM would cause shifting issues. That's a completely new one for me but one I am definitely investigating. It makes no sense since all the FICM does is control the injectors. The only thing I can think of is that it is affecting the torque output of the engine and causing some shifting related oddities.

Anyway, I'm hoping to test a few new code changes this weekend to see if this clears up, but not exactly sure if we'll be able to identify it unless we're experiencing the problem as well.