[Al 29Tudor]

Another step in the right direction - To explain, Just before this all happened the temp was about 1/8 inch showing on the motometer. Then for no reason it began to run about 1/3 the way up the motometer.
So today I took it out and the same, 1/3 the way up.
I filled up with E-Free fuel, (.71 more per gallon) it took 9.34 gallons.
To my amazement the engine temperature went down to about 3/16 up on the motometer.
I wonder if the fuel formulation here in south FL change in the Spring?
So no more backfiring. There is still some missing but it's very quiet.
I had changed to a new set of 3X plugs just before this happened. So next i'll put the old plugs back in and take a ride - lets see what happens.
Johnbuckley - I like that hot wire test circuit you sent. I printed it out - thanks.
Al