Hi everyone, I have a 88 f250 custom. I recently had the fuel pump replaced after it cut out completely on me one day. The truck starts just fine, but when braking, going down hills, or coming to a stop it seems to stall every now and then. Obviously I want this fixed before I start hauling things and become a wrecking ball on wheels. Any thoughts? This stalling problem started as soon as the new pump was installed.

 

Test your Brake Booster for vacuum leak ...

-Enjoy
fh : )_~

 

Does it want to stall in any other situation? What if you rev it in park/neutral? Does it want to stall when it comes back down to idle?

 

No it comes back just fine

 

So I got a new throttle sensor and idle air control, I ran it for 20 mins and it ran great other than a struggling idle at one stop light. After a few hours I took it home and it stalled 2ce. Once was as I as on the gas. I'm lost. Fuel pump and fuel pressure is good

 

Try pulling the codes.

 

Will definitely do that. Could it be a vacuum leak? Most of the hoses on this thing are original. I haven't checked that yet

 

It could possibly be a vacuum leak. Try looking for suspect hoses, especially the hard plastic (usually red/green) vacuum lines.

 

Update: no codes came from it. Thinking pcm now? Also learned that truck has new fuel filter as well

 

How did you attempt to the pull the codes? Paperclip/jumper or code reader?

Could be as simple as corroded pins in the data link connector. Spray some contact cleaner on them or use a small fingernail file to shine them up.

 

Code reader

 

Highly suggest you clean the data link pins. This assumes you got no codes at all, not the System Pass 11/11.

 

I told my mechanic to replace the fuel pump. It just bothers me how when it first went on it leaked really bad then the issue started. Plus thats cheaper than a pcm. Need to get this thing fixed soon

 

Cleaning the pins could be free.

 

Forgot to mention, sometimes when it stalls it doesn't shut off completely for a few seconds. When u hit the fuel it's like it's just out of gas then it finally dies. Other times it shuts off immediately