Speedo is not functioning properly. Trip down (Chicago to St. Louis) it was hopping back & forth between 65-80mph though i manually maintained about 73mph. Today on the way back to Chicago it got much worse hopping back & forth but decreasing the range as i drove until it was hopping from about 0-15mph though still maintaining around 70mph manually. At this point the engine began cutting out intermittently (almost as though burping).
It does fine short trips around town but seems to act up after about 1/2hr on the highway. My guess is speed sensor is bad. i identified one on the rear dif and checked at O'Reilly Auto for a replacement. They showed the part but said i have to go direct to DC to get the part (at which point i decide to go back to St. Louis rather than test my luck all the way to Chicago).
i believe there are 2 speed sensors for the '04, six speed, 3.7L?
Where is the other sensor? Any other thoughts on diagnosing the problem?
As always TIA!
