Hi all, My son has a '92 Riv (mine is a '91) and is having some problems. When the engine RPM's normally drop back while going into the "*coast down" mode on the highway, the car starts to shudder mildly. It is similar to when driving a stick and the gear is too high for the speed of the car. The steering wheel shakes and all that good stuff. When stepping on the accelerator to get out of this mode it seems to stop shuddering. Just replaced plugs and wires in his car a few months ago so that shouldn't be a problem. The tranny fluid is not low. No Codes have been tripped and the Service Engine Soon light has not come on. Can anyone give me some idea's what to check or where to start? Thanks, Clark *When driving on the highway with a steady accelarator the RPM's normally drop like going into an overdrive mode.