I have a (99 2.5'l ranger ext cab\step side 2 wheel drive

The bad

The motor is jumping at IDl\low end acceleration it seems
to run better at 3000 rpm it clears up to a point but it still ther
but not as bad under hard acceleration it is there.

And yes the check engine light is on and blink under mild to hard accleleration

OK what have I done so far.

Well let see

I have replaced both coil's pack's twice,

plug wire's twice, plug's once, fule injectors once,

New fule filter, took the catalytic converters off thinking well it my be it

short story it's back on :(

There only two code's are up (streem O2) and (EGR) there wore more
but there gone now like misfire cyl 2, down streem O2, exedra exedra.

Now the motor has less then 20k on it so dose the fule pump,
timeing belt, the truck never ran hot and has had it
oil change every 3000 mile's.

Now what could this be.
It getting to me bad the truck never had
the get up and go like it supposed to but this is just sad.

 

what sensors have your replaced? My o2 sensors have given me grief on all vehcles. Have you replaced those?

 

The up streem O2 is bad on the truck but it been bad for over a year

The thruck has just now start'ed to act up with in just the last 2 months

it not that it something else

 

So you're getting the o2 error code, you've already done all your ignition and you don't think that maybe the o2 sensor isn't it?
your call.

If you're o2 sensor is bad, you will be getting wrong fuel mixtures, possibly resulting in misfires. That's what the o2 sensor does, it regulates your fuel mixture.