Misfire and flickering dash

[ifconfig]

Hi,

I have a problem with my Tahoe 99.
If I'm running and turn on the head lights it sometimes misfires for 5-10 seconds and then runs normal.
I think it's connected with the problem that when I use turn signals the indicators in the dash flickers (like abs indicator) with the same pattern.
The abs indicator and button lights for the 4x4 selection turns on intermitent.
On idle I measure 14,5V on the battery.

To me it seems as a ground problem.
Any ideas which ground position it most likely can be?

Regards
Magnus

 

[SunlitComet]

check grounds on the rear right cylinder head, thermostat housing(likely will have two), right frame rail to engine and battery, right fender to battery and battery terminals for starters. may need to get vehicle lifted to see the ones on the rear of the head by looking up thru the the tranny well. you will have a few there.

 

[ifconfig]

Thank you.
I will look into it.