96 Legacy brighton 2.2 engine(140,000miles)-
with very similiar problems as those above ie: engine misfires under load (Throws a code which when read, says one or two cyl.misfire). It is inconsistant,happening at various times usually at high speed on hills, also with varying fuel levels, it lasts about half a minute and then seems fine. We have tried numerous solutions: de-carbonization treatment done professionally several times, it seems to help, but the problem returns, replaced: coil pack, plugs, wires, a bad cat. converter, fuel filter and had compression test that was judged fine. The latest suggestion was to try higher octane fuel and dry gas. Since using super it has happened once - just added dry gas and we'll see...
wondering if any one has any suggestions?
any suggestions...at all... we're desperate.