[..:: sleestak ::..]

you could be misfiring. have noticed any backfire?
or perhaps your fuel pump is starting to go?

 

[LastRites]

On your car if you do a ride at 30 MPH in 3rd and it's bucking like mad I'd be willing to say I'm positive it's your DPFE. That was my test every time and I was always right. The DPFE sensor on your car is extremely prone to moisture and humidity damage causing a fault.

 

[socrates]

it is a misfire.....

thats the result of what ever is wrong

anymore advice- how many miles on the car b4 i check the fuel pump? it was replace with a recall at about 45K