I guys. I'm a new f150 owner. I've had a 2004 5.4 for the past week. It has driven great until today when it stalled at a stoplight. I was able to reproduce the problem in my driveway by putting it in drive and holding the break. The rims slowly drop to about 450-500 and it dies. No oil pressure change or anything lie that.

Yesterday I replaced the airbag sensor and did the gotts intake mod and removed the intake baffles. I did have the battery disconnected for the airbag fix but not the intake work. Could it be something I did the the intake?

Appreciate your help. I searched using e iOS app but there wasn't much for results.

 

Rpms drop to 450-500, not rims

 

Common. Dirty throttle body (carbon buildup behind the plate). Get a can of throttle body cleaner, disconnect the battery, remove the air cleaner then throttle body assembly, (DO NOT REMOVE THE SIDE SENSOR/POTOMETER), spray the backside until it's clean, re-install, then go for a half hour drive so the PCM can re-learn.

If you search on IDLE, POOR IDLE, or throttle body, you'll find plenty of posts on this. You're not alone!

 

Did you remember to put the vacuum line on the back of the intake? Pull the line off of your vacuum solinoid by the battery and PCM on the firewall and check for suction

 

Check ur idle air controlled valve.

 

had this same problem and i did the same process bucko described. should be what you need.