Think my vehicle speed sensor may be checking out. Can I by pass it to see if the truck runs smoothly or must it be connected. Just replaced it less than 10k ago and don't want to just buy another one until i'm sure its the cause. Speedo keeps fluttering and spiking and engine runs rough while its happening. The odd thing is yesterday the speedo went dead for about 15 miles and engine ran fine while the speedo was dead. Thanks for any input.
John
John