I've changed the cap, rotor, plugs and wires, trans fluid/filter and a fuel filter and the hesitation/ stumbling problem still persists.
I would lean towards a fuel delivery issue if it was at idle as well as under acceleration, at idle it's fine. maybe I'm wrong?
our weather here has been warm and dry for quite awhile now and I finally took the van for over and hour drive, at speed, twice in one day when going to my mothers house last monday.
the problem is still there, it's still as bad. and get this... it's also at highway speed. it happened several times while right around 120kmh (75 mph). under both acceleration and deceleration, right around the same speed. i rarely go on the highway and thought that my under 60kmh (40mph) driving was not helping and I figured the highway long run at speed would smooth things out. it didn't.
I'm not sure how else to describe it other than stumbling, hesitation or lurching. almost like either fuel is being starved for a spilt second or the tranny isn't sure what it wants to do, go don't go, ok go. remember, at idle it's fine, only under throttle is when it occurs... could it be a fuel pressure regulator? if so, where are they located on a 99? lemme guess in or around the tank?
![Banging my head ](*,)](./images/smilies/eusa_wall.gif)
I'm really at a loss and can only think back to it feeling like my dakota 4.7L did when my TPS went bad. yet, I've never heard of you guys talking of TPS problems.
I can't really afford throwing tons of parts at the thing trying to solve the problem (the plugs wires cap and rotor were due) but, I'm not really sure what to do next. the tps ain't cheap, nor is a fuel pump, nor is pretty much anything else. one thing I haven't changed in the ignition equation is the coil.. but again, wouldn't this also cause a rough idle (which i don't have).
i'm totally stumped and just want to get this resolved.... thanks