When we dropped the tank to install new fuel pump,,there wasn't hardly any gas left in it,,and it didn't smell like varnish,,I have run about 25 gals. through it so far,and things seem to be going great ,until I started it up acouple times and let it get to operating temp in the driveway (Very cold up here) ,I didn't drive it though,,went to take it for a drive the other day and this started. just to mention,No CEL and when it did back-fire once while trying to get going,,the CEL and the light next to it ,flasded on for a second,but didn't stay on,,I have heard about the ICM runs just the 4-pack coil??? ECU runs the 6-pack coil??? could this be it??