Loss of power on hills, then engine wont start. HELP!

[gus]

Partly clogged filters will not always show up during low to medium engine loads, it is only on the hard pulls that it can't get enough fuel.

I doubt the angle of the hill has anything to do with it.

So -- always check filters first. Doesn't hurt to change them anyway, no point in waiting until they clog. Change the primary first, make sure the engine runs ok or even check it out on some hills, then change the secondary.

If you have crap in the tank the filters are just doing their job.