I have noticed that my 305 k5 has very fumeY smelling exhaust at idle. I can let the truck idle for 20 minutes and then check the plugs and they are very clean almost white(but this dam near runs you out of the garage). The truck does not seem to run rich nor is there any driveablity issues either. The pipes are a little sutty.....
Open to all suggestions....
Open to all suggestions....