I have a 1993 Chrysler LeBaron, 3.0, 4 spd auto... While cruising - not accelerating or decelerating - just feathering throttle... engine skips and bucks and seems to misfire... seems ok when accel or decel. After a brief (5-10 seconds) wide-open throttle burst, the problem seems to clear up for awhile, but returns later. Any ideas? Fuel filter has been changed. Plugs have been changed Replaced cracked vacuum line near EGR