258 w/ HEI, vacuum advance issue?
JacobL
Jeeper
- Posts
- 16
- Thanks
- 0
- Location
- Red Springs, NC
- Vehicle(s)
- 1984 Jeep CJ7
258 Inline 6
T176 4 speed
Dana 300
When I bought my jeep the vacuum advance didn't have a line hooked up on the HEI distributor. I took an extra vacuum line I had and hooked it up. When I revved the motor she was poppin and backfiring and making a big fuss. I disconnected the vacuum line and she runs smooth again. Any idea what would cause that? I have had a few AMC 6's and 8's and have never run into a problem like this before. I did adjust the timing and that didn't change anything as far as the backfiring and popping.