[richard2717]

Originally Posted by AussieinNC

I have found the biggest issue with these around your mileage is poor grounds and or corroded connectors especially the ECM ground wire that attaches to the chassis down under the radiator support along with the main battery ground cable....

The ECM wire to ground should be cut off and replaced with a new (preferably Gold Series) connector that is soldered to the wire.

Sandpaper the chassis well, plus any and all cables that may conncet at this point.

Then look for and find every ground cable on the engine....some are under and near the engine mounts, some at rear of cylinder heads...each one needs to be cleaned very well....remove the bolt, clean the area and the connectors with sandpaper until shiny then reassemble.

The temp gauge issues are pointing to bad grounds...

Erratic readings of temp will cause the ECM to provide incorrect fuel mixtures and spark timing...

Finally, remove both battery cables from the battery and clean the ends of each cable and the mounting points to the battery...

Thanks for the detailed reply on where I should be looking. I am hoping to get it all taken care of tomorrow or Friday.