Just yesterday my 4.0 manuel, ext cab , 4x2, w/ 250k on it, started to stumble badly under accl. Once I get up to cruising speed its alright. A starting point would be great. Thanks.

 

new engine or rebuild kit lol, try plugs,wires,fuel filter, air filter,check fuel pressure, 1st, if that dont fix it get a scanner and check 4 codes on sensors

 

I really like having the scangageII for looking at sensors.

Could be an exhaust restriction,bad O2, could be a LOT of things. Bad tank of gas?

 

A dirty MAF can cause that also. Look for dark film on the air filter side of the small sensor wires (requires a Torx tamper-resistant bit to remove sensor). Clean with brake cleaner and compressed air. Might want to check/clean it first before you start buying parts.

 

When was the last time you changed the plugs and wires?

 

make sure you dont have a plug wire grounding out. It would still be missing but at crusiing speed you "might" not notice it. Tonight when its dark open the hood and start the truck and look for sparks. Or with the engine off just look for burnt areas on the plug wires. could be a place to start looking.

 

I just changed the plugs and wires.

 

might be a fuel pump starting to go out

 

everything they said lol ^^

 

your turbo encabaculater is prob out of adjustment. go to the part store and rent the tool for it

 

No it was the flux capacitor, runs fine now

 

250k you got your money out of it time to upgrade to a F-250! Or Newer Ranger.