Question? I am running a bone stock 1969 350-4 GS Automatic. How often (miles, Year) are you changing your plugs? I replaced mine last year with Autolites and now I have a little miss (after 4000 miles). All my tune up parts (complete) were done last year, first time in years! I gapped the plugs @ 32 per the "decal" the ones in it were at 35? What best? PS: Out of those 4000 miles only about 300 were above 40 MPH Mark
