Your tuck may have a cabin air filter if so replace it, plus you might want to check your cowl for derbis.
December, 21, 2010 AT 6:10 PM
Dave is correct. Dirty cabin filter would restrict air flow.
REMOVAL & INSTALLATION
NOTE: Manufacturer's terminology for this filter is cabin air filter or passenger compartment air filter.
CABIN AIR FILTER
Removal & Installation
Cabin air filter is available as an optional dealer-installed kit. Cabin air filter installation instructions are included with the kit. If a filter is already installed, it is located under the right side of the instrument panel in the HVAC housing. Trim panel may have to be removed to gain access to filter. See Fig. 1.