Check the wire connection at the block sensor, it may be broken or ready to break. Mine just did this, I had to resolder the connection, now no jumping. Keep notes on the mileage for fuel consumption, you will soon find out how far you can go. Good luck.

__________________
If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon