My Voyager is backfiring in the aircleaner at 3700-4000 rpm when i drive it and if the gearbox is in park and i rev it up to the above rpm. It starts to missfire slightly and if i press the gas even more it will backfire so much that i even blown a aircleaner top off. This happens almost everyday but sometimes it will run perfektly. I´ve changed wires and plugs whith no change. There is no error code in the "check engine lamp" only 55.
Is there someone that can help me, i´m going crazy over this. I´ve read a lot about mis/backfiring here, but nobody seems to have exactly the same problem as me. meaning at a specific rpm regardless of load/uphill/downhill/decelerating/in-gear and so on.
Help please!!!!!!!!
Janne