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4.2 really that underpowered?

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carnuck:
Sounds like you haven't advanced the timing to account for the higher altitude? Maybe the mechanical advance in the dist is sticking? Vacuum advance blown out? Loose intake to head bolts?

JayRamb:
I tried a lot of stuff with my 87 Eagle to get it more power. Finally changed out the CAT and muffler! WHAT A DIFFERENCE! MUCH faster acceleration and faster passing power.

Nightpath:
I know this is old, but I found that with the old 258, in Eagles or Jeeps, an upgrade to the ignition system is hands down the easiest and best upgrade to it that can be done.

The 258 was mostly low end torque, and there are ways to get it to perform better.

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