|
A WAI won't do anything for a newer car like an '05. I don't know Hyundai/Kia engines but manufacturers have been heating the intakes on economy cars for decades now.
It's perfectly normal to lose some MPG from weather/fuel changes for winter. But idling rough is usually a sign of another problem. Unless there are no codes and it's up to date on maintenance eg. air filter, fuel filter, oil filter etc. In which case it could be a gimmick of the design.
__________________
-Allch Chcar
|