A loss of power on the freeway may due to an internally leaking fuel pulsation dampener. This commonly occurs on higher mileage vehicles.
Car Problem Reports
Geo Prizm Loss of Power on Highway Due to Internally Leaking Fuel Pulsation Dampener
Geo Prizm Problem
Engine Affected: 1.6L 4 Cylinder
Visitor, 1995 Geo Prizm, 1.6L 4 Cylinder, 107,000 mi
for some unknown reason i have total loss of power even with a full tune up after 40 miles per hour cant maintain speeds on highway slows down going up a slight incline no one can find the issue this could be it