High Speed Miss?

[FED 387]

make sure you run a ground wire from the head to the block ----a ground wire from the engine to the chassis ----a ground wire from the MSD DIRECTLY to the battery and also the chassis ---Check all your grounds make sure they are CLEAN--no rust, paint crud etc. These things get real finnicky at rpm can have you chasing your tail for months See if this helps--also try another RPM chip see if it has not failed they do go bad every now and then-Swap out YOUR MSD box with another box you might have a bad one-

Comp 387-