Our 99 with 252,000 miles has started skipping/misfiring when under load, but it seems to be only once it's warmed up. I thought it was a coil pack starting to fail, but that has not happened yet. Problem does seem to be getting worse. I've checked it twice and it's showing no codes at all. Through researching threads best i can come up with is a failing injector. Throttle body is clean, plugs have +/- 50,000 miles on them (possible bad plug too). all else is perfect. i don't know what else to check for before taking to local dealer... Thoughts?
