Well, it should not take four hours to replace the rear plugs, but the engine needs to be cold. You have to reach up from underneath the car along the firewall to get to them, if the engine is hot you will burn your arms on the exhaust and such. I did it on my 1995 Voyager and it only took me about an hour.
Could be several things, might be worth the price to have a good shop diagnose it using an engine analyzer, you might have to leave it overnight, however, so that they can reproduce it.
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