idle issue

[ecss]

MSD products have always had problems with GM tachs.

Install the OEM coil and see what happens.

Look at this link and the paragraph Tachometer. Read the last two lines. It describes the exact problem you're having with your tach.

http://static.summitracing.com/global/images/instructions/msd-6420.pdf

Did you install the MSD coil and MSD ignition box?

 

[nyernga]

MSD products have always had problems with GM tachs.

Install the OEM coil and see what happens.

Look at this link and the paragraph Tachometer. Read the last two lines. It describes the exact problem you're having with your tach.

http://static.summitracing.com/global/images/instructions/msd-6420.pdf

Did you install the MSD coil and MSD ignition box?

Installed the original coil and the tach works fine now. It runs better but did stall once after a short drive. I'll give the ecm some time to relearn and see what happenes but so far it looks like a fix.....and I just used an MSD coil....no ignition box

anybody want an MSD coil? hardly used?

Len