I have had this happening for a while and I can't figure it out. I have the TST R39 with the standard programming. Any combination of setting I get a slight hesitation between 1900 and 2100 RPM's while cruising. I can be on 1/1 and still feel it, but if I drop to 0 it's not there any more. It happens when I have the cruise on as well. If I am accelerating and it just passes that RPM range it's fine, no hesitation. But, if I keep the RPM's within that range it happens.

Is this just a spot with my truck where there is no middle ground to speak of? I have not noticed the hesitation when I am pulling a load.

Thanks.

 

mine to. but with mine, i also have the white smoke @ idol. so im thinking its ingectors. good luck

 

Anybody else have any thoughts? It's only at that RPM, any other RPM it screams... gotta love the TST...