HI,
Problems at idle normally would indicate a vacuum leak.
A blocked fuel filter or poor fuel pump would give much less power at higher speeds, or while getting up to speed - say entering the freeway.
Vacuum leaks can be found by spraying with something like WD 40, and the idle speed will change when you spray it near the air leak.
Unless it is a major leak, it is probably something I would rather fix after the trip. It might involve removing the air intake, and re-sealing it. You might also only have a couple of cracked or leaking vacuum hoses, something that is really easy to fix in route.
Is anything not working? Bounders use electric controls for the heater/vent/ defrost system, and will not show up the typical vacuum leak symptom of changing to defrost when there is a vacuum leak.
Also does this happen only after driving for a while? Say when you start the engine in the morning, is it a problem? Or only while it is warmed up?
Good luck!
Fred.
