This was done for a 1997 Plymouth Grand Voyager---Replaced spark plugs on the front of the engine, even numbered plugs, ran van for a mouth...all was well. Changed the two odd number plugs in the back of the engine, now engine backfires, appears almost like a timing problem.....what would cause it?.....(same plugs and wires in the back as in the front). What was done wrong? Please reply......
Jan 7, 2011 at 5:31 PM