really, too, if it is too lean it wont idle correctly or run smoothly.

lean running should make your plugs white. black is too rich. light brown is the correct color.

in the old days of lead gas a light gray coating inside the tail pipe was indication of correct mixture too. but now there is only black which in the lead days indicated too rich.

tom w

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.