have 2004 Ford, thought it needed injectors because it was struggling hard almost a side to side movement. Had a friend recomend replacing the FICM, did that now it stumbles, less often, less movement like it's muted. I noticed it again yesterday after hard breaking, but also really likes to do it in heavy traffic. Any thoughts?

 

If changing the FICM helped, test the rest of the electrical. Check the FICM voltage, engine voltage (alternator), and load test each battery separatelyl.

https://www.ford-trucks.com/forums/8...procedure.html


What kind of oil and what's your oil and fuel filter change interval?