I have an '03 Ranger Edge Supercab 4.0L 4X4. I put a 3" BL on it on Friday. I did everything step by step the way the instructions told me too. The only thing I did not do, right away, is extend the filler neck (the kit didn't come with the correct parts to lengthen it).

On Saturday, I changed the oil, cleaned my K&N Filter, and put my 35's on. I drove the truck around all day (put about 60 miles on the truck).

This morning, I removed the filler neck. I went to a couple parts stores and couldn't find the piece i needed, so i went to hardware store and got a piece of brass sink drain that fit. I cut everything to length and sanded down the rough edges. Then, I hooked everything up and went for a test drive to the grocery store. Drove perfect, no problems at all.

Then later, I was heading to the in-laws house and started driving up a hill by my house and it started to bog down. So I pulled over checked all the connections and turned around and took it home. The truck will start and idle fine but as soon as I hit the gas, the RPMs drop and it feels like its going to stall. However, I am not getting any dumbie lights...

Tomorrow, I plan to pull the bed and check all the connections on the filler neck.
I was also thinking that maybe a piece of rust or something may have worked itself into the fuel filter. So I plan on changing that too.

Any other suggestions on what it might be?

 

Okay... I think I figured it out. I unplugged the MAF sensor and it ran a little better. So I ran to advance auto and picked up a can of MAF cleaner. I sprayed the whole thing down and took a Q Tip to the stubborn areas. Then I let it dry and hooked it back up. Runs great and the throttle response is back.

Resetting the computer now and then taking it for a ride...

 

Clean your throttle body out also.