Amigo Loses power on Hills
A Internet-less buddy has a 1992 Amigo that -sometimes- loses power going up hills, and has to shift down to 2nd or 3rd to even sputter up a hill. Once we get level, the Amigo will go better and will rev out like it should. It's a 4-cyl, with 232k, had it for 10 years but last year it started sputtering up hills.

Any ideas ?