Got a 2000 intrepid with 82k miles ( the old lady works 40 miles away) and the thing has a rough idle and code P0303, misfire detected in cylinder #3. Dealer wants to sell me a new engine for $3600.00 bucks. They really want to bend me over. They said the had low compression on #3. I'll verify that later but for now how hard is it to swap from a 2.7 to a 3.5 in this thing. Or has anybody done a rebuild on a 2.7. Trying to get my options together.