I have a 2001 F25 with the 7.3L. Recently I've encountered some kind fo electrical problem. I think. When I bring my truck to a stop and put it in park the truck will rev the engine up to about 1300 or 1400 RPM for a few seconds then settle back down to idle. Also one time while stopped and in park the speedometer started jumping all over the place. I have a DP Tuner. The truck will do this when I have to tuner on and when I have the tuner off. I don't know where I need to start looking. Can someone point me in the right direction of where I need to look to fix this problem? I can answer any further question y'all might have. I recently replaced the speed sensor because it threw a code and was hoping that would fix the problem and it didn't. Thanks for your help.

 

id pull the chip first, see if problem exist.

 

Okay. Thanks. I'll try that. Anybody else ever experienced this?

 

Check the alternator output for voltage and amperage.
Check the batteries for voltage and amperage.
Get a digital volt meter that plugs into the cigar lighter or power point.
12V/24V Car Digital Battery Volt Meter - USD $ 6.99


An improper voltage can cause some of your symptoms.

 

Did you ever find the root cause of your problem? My truck did the same thing to me the other day.

 

I think my problem is linked somehow to the trailer brake controller. I leave my controller unplugged when not in use. I only have the symptoms when I plug my controller in, with or without a trailer. At this point it makes no sense to me.