[rodcain]

'98 w/3800, approx. 120k mi.
I was losing an entire overflow tank of coolant per week
for about 3 weeks in a row and gas mileage dropped.
Of course I thought my upper plenum was bad. Then it stopped completely and decent mileage has resumed.
What is happening?
I have been reading of the intake problems and solutions on this forum for about 5 years now and trust
the opinions of the moderators.

Thanks,
Rod