When my car gets warm the idle sits at 500 rpms. That seems a bit low but it stays running. Sometimes it will stutter and stall but it doesn't do this all the time. I've heard that I might need to check the gap on my SP's. I am using autolites and they seem to work ok.

 

best plugs are ac delco's...

 

crazy thing is I had delco's in there when I was trying to fix the head gasket and I couldn't figure out why the car wouldn't start. I tried everything from two sets of injectors, TB and come to find out that the new sp were bad. I hadn't even drove the car and they must have went bad from all the cranking.

I might try them agian when I need to change them.