I'm looking at buying a first gen 1988 4 runner with the fuel injected I i live in the mountains and will spend a lot of time driving it in mountain passes and steep hills i probably wont be towing much and if i do it wont be that heavy the heaviest i could ever do and this would be unlikely would be a 2 horse trailer. is the 4 enough to handle the steep mountain roads it is a manual. there are lots of trucks around here and i want enough guts to accelerate from 75 to 85+ quickly to pass them. is this possible. also i was wondering if there are any cheap fixes for the back end sag add a leafs??? cannibalize springs form another truck???