What replacement engine should I get for my 4 cyl 2.5L Jeep Wrangler TJ?

Kiefer

New member
I recently got a 4 cyl 2.5L 1999 Jeep and have been having a blast and it goes really fast however when I hit hills on the highway I can't go more than 60, and sometimes it won't even exceed 45. I've done a little bit of looking around but I'm not sure what kind of engine I should get. I don't do a lot of 4x4 but I do get out there occasionaly. I also don't know a lot about engines and replacing them but I have some friends that do, and I'm on a bit of a budget so help me out if you can.
 
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