What causes my 1996 Discovery to hesitate or pause on the highway? It will hesitate without loosing speed or RPMs for about 3 seconds then it will return to normal for under 1 second. This will continue for 5 to 10 minutes then resume normal performance. This has been going on for years. It happens more in the summer when it occurs once or twice a week. The dealer claims ignorance and so do my other mechanics. (The fuel pump has been replaced before.)
What gives?