morning, I am new to this forum but found your problem is very simalar to mine, I too have replaced sensors didnt know about the plenum gasket I am going to try it, is your idoling speratic?? mine dosnt do it all the time but it is getting more frequent, I am also using more gas lately and I can hear air coming up through the throttle body (well more than i should) I have a 99 ram 4x4 5.9 with 150,000 miles on it been real good to us but this problem is more annoying then anything else

 

Did you check by the front axle? Isn't the actuator run off vaccuum? Under dash?