i got a 86 mitsu dodge d-50 2.5L that has about 300K --
it did the same shit --get very weak going up hills, lose power --back fire and so on.
the solution on it was there was rust in the gasoline tank --when going up hill the rust flakes would puddle up over the fuel screen restricting the fuel just enough to cause the problem.
all i had to do was drain the tank a couple times and it runs fine now.
don't know for sure if this is the problem with yours because it is another model--but it won't cost much to check it out===
otherwise the scrap yard was offering $300---LOL!
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