tmdriver

I have a 92 Crown Vic LX in great shape with only 63000 miles. I have had it since 9000 mi and it has been a very good car however, I have noticed recently that the gas milage has dropped off 3-4 mi a gallon. I could try changing the plugs as they have been in it for 50000. they are Boesch single prongs. I have also noticed a slight “lugging” at lower rpm ranges in the highest gear. I also have a clean K&N air filter. I use reg unleaded, change the oil regularly with synthetic and have also used slick 50 when I first got it. The car does not receive any dealer maintenance but, I do keep it up well. I was wondering if you knew of any such item that should be done such as valve adjustment or anything which might contribute to my concerns. I am also wondering could it be the intake air temp sensor. If anyone has any ideas please let me know,,,Thanks.

ryoder

Change the plugs! Throw away the bosche plugs and get motorcraft. At least my 92 likes them better and it hated the bosche.