Those vehicles had port injection which sprayed fuel before the intake valves... cleaning them with the detergent/solvent effects of gasoline. Modern direct injection turbocharged engines have a track record of carboning up intake valves because the fuel is injected directly into the cylinder.. never sees the valves. The worst I have heard with this issue is the Mini Coopers... some getting so plugged up by 20 or 30 thousand miles that they misfire. There are several YouTube videos about the issue if you’d like to research it. This is also why Toyota and Ford are both now using port and direct injection together on their new engine designs.
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My 2.0 Audi A4 B7 had this issue after 40K. It also burned oil bad. I had carrying it in the trunk. I’d tuned it & upgraded the PCV but nothing helped. That engine was a disaster waiting to happen.
There’s no replacement for displacement. If you plan on keeping your Jeep get a v6