Originally Posted by rabiddawg
car runs great at idle or full throttle
but cruising at hiway speeds it misfires (kinda like spark scatter)
low backfire in the exhaust aswell.
but if I step into it the motor seems to run pretty good?
I have the digital e curve set up using a MSD6AL aswell.
both got good power from battery.
hooked to the + post on battery.
grounds are both on the valve cover hold down.
btw aluminum heads and intake.
engine grounded to frame and battery -.
ground wire also between the engine block and valve cover hold down where the msd 6AL and digital e curve distributor are grounded.
Seems im not the only one with this issue
I talked to a guy at a carshow and noticed he had same problem with his digital e curve dist
I will take a stab at just something I see when reading what you posted. Keep in mind I do not or have never used a E Curve Dist.
grounds are both on the valve cover hold down.
ground wire also between the engine block and valve cover hold down
Could be wrong here but try running the ground straight to the chassis, better safe then sorry for sure, a ground issue can cause all kinds of issues.