If you've ever been disappointed by the horsepower figures coming from your Jeep Wrangler JK, whether it has the 3.8-liter or the 3.6-liter V-6, and you've considered an LS swap, you're not alone.
The 1987-90 YJ Wranglers launched the EFI era with throttle body injected 2.5L AMC four-cylinder engines. The legendary 4.2L inline sixes remained carbureted through 1990. In 1991, Chrysler switched ...
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