Greene728 wrote:
swimmer_spe wrote:
Hannibal wrote:
I changed the spark plugs in my 5.4L last week. This week just returned from a trip to the east coast and back. Ran better, better towing mileage and no hunting. Held 1750rpm at 60mph for miles on end. Downshifted when needed and settled back to 1750rpm.
I found out my spark plugs are overdue. It'd be nice if that was the problem.
Its not.
It could be. Mine ran fine except for a stumble on light acceleration at low rpm. Four plugs were missing their platinum tips and we're firing to the edge of the plugs. Apparently they don't last 100k like the manual suggests. If plugs are due, why not give it a shot.