What causes a van to surge at 55 mph?
What causes a van to surge at 55 mph? While driving around 55 mph the RM would surge unexpectedly. We would have to stop the van and wait for 1 minute and start it again and it would run fine. It has been 1000 miles since the last incident. This started happening after the ignition switch was replaced because of the recall. Why does the speedometer jump up and down? Speedometer erratic, needle jumps up and down as I speed up..? First of all i want to thank all o you that provided excellent possible solutions to my carburetor problem...