I just recently got a 92 flareside .....from my dad.. The truck has a miss in it whenever It has to pull a little ...other than that it runs smooth.. Check engine light is on and the only codes were all for the egr valve the guy told me to clean it up... I did and checked the egr and it seems to be functioning correctly ... But my dad said that he had replaced the egr back in 96 because of the engine light but the light never did clear??!?!.. Any ideas what it could be?

 

see if the cat is clogged that might cause to much back pressure when hauling.

 

I'm sorry.. Not when hauling but when having to go up a hill... ... It loses a lot of power and starts hesitating.. I haven't hauled anything with it yet to know if it does it then or not

 

it might be the injectors run some fuel injector cleaner the chevron brand is the only one that works great. see if there are any codes stored as well.
to learn how ceck the odb1 code sticky on top of the page

 

Fuel pump. Mine does this also. If you have duals change tanks and see if it clears it up.

 

Just got one tank ... Thanks for the help fellas ... I will try the injector cleaner and I will let you know how it works out! Probably gonna have to give in and take it to a good ford mechanic

 

sometimes a bad plugwire or sparkplug will cause this problem just a thought it wouldnt cause ur check engine light to come

 

Wires and plugs were replaced about 3 or 4 months ago

 

Fuel pump was replaced in 2007 so idk cat is good too

 

Doesn't matter if the fuel pump was replaced yesterday bro. Pull some codes and lets see what's up. Electrical things such as fuel pumps die on a daily basis.