Hey guys.

57 Tbird with a 312/Fordomatic

I checked my plugs yesterday and found that the first 4 plugs from the front of the car (2 on each bank from the front) were dry and had a nice tan colour indicating a nice clean burn. The next one each side were somewhat lighter the porcelain almost pure white and the last 1 on each bank closest to the firewall were extremely white with a bit of ashy crusty deposit on them. Is the result of needing to adjust valves? Can this also be the cause of my engine vibration at around 1200-1400 rpm range. It does it in park or neutral and also when I am driving it.



Thanks