I have an '02 Supercrew XLT with 65,000 miles. When driving with the RPM's around 1200 to 2000 or almost always when the tranny goes into automatic overdrive the truck starts to surge. It feels kind of like a miss fire, or maybe like the truck is choking on some bad gas.

If I mash the accelerator down it seems to power through it, but it always comes back. If I turn the overdrive off is seems to go away. Initially I thought that meant I had a tranny problem but I think the surge goes away when overdrive is off because the RPM's go up.

After a few days of this it is obvious it is not going away. Today the service engine soon light came on.

Has anyone else experienced this before?

 

i posted it under the engine section and the title is new member here help me. take a look under there i havent had a chance yet to try it but im almost positive its gonna be that thing that sends codes to the egr.
jesse

 

Yup, just happened to me this morning. I'm gonna get my codes checked. Hopefully it'll pull a P1120, then I can relocate my harness away from my AC accumulator. -Although mine also smells of sulfur when it is run for a while, so I probably won't be so fortunate. I'll be back tomorrow with more details.
5.4L motor

 

EGR leaks typically involve a rough idle/stalling but not a noticable loss of power.

-Get your codes read for free at an auto parts dealer.

 

It might still be EGR related.
Your rpm range in OD suggest the engine is in cruise.
This opens the EGR, advances the timng and leans fuel.
I would take a good look at the spark plugs as a first step. If they have a lot of mileage on and have deposits, I would replace them.
During cruise, if the plugs have any deposits from fuel additives, they can missfire during EGR operation only, when the fuel goes lean, placeing extra requirements on the ignition coils they can't meet.
This is how the two become related and form a faulty operation.

 

Chrisbutts...

I double checked my problem. It is not related to OD in any way. It ended up throwing a missfire #2 code. I pulled the coil, measured the primary and secondary. It's bad. Replaced it and now as good as new...

sorry for not being much help to your problem

 

Thanks for all the input. I changed the plugs last night. All of them looked pretty white on the ends. Not horrible, but they definately needed to be changed. I took the EGR off for kicks and cleaned it out with carb cleaner and opened the throttle body up and cleaned it out as best I could.

The missfire (or whatever it was) seems to be gone. I left the negative cable off to clear the service engine light but it came back on later. I went to Auto Zone today to have the code read, and the guy said there must be a problem with my unit because it would give him a code at all.

It's running fine though.

 

It's not a good way to clear codes by removing battery power because you loose all "learned" programming as well.
At the least, the ECM would have turned the CEL lamp off after several driving cycles providing the fault was fixed.
The proper way is to clear code with a scanner after work is done so you are not looking at old history and also see any other codes to clear by repair.
Not to worry, the lamp and codes willl come back as new and be a check point to see if your work has corrected the problems and or the code # has changed.
Now you start over again..