The error U1228 Code is a short description of the car engine problem and the problem should be fixed as soon as possible. Gas engines use spark plugs to reason an blast of fuel within the cylinder. In a correctly timed engine, this blast happens at the correct instant to send the piston to the bottom of the cylinder and deliver power to the drive shaft. If the plug wires are out of arrangement, the explosion occurs at the incorrect time. The unsuitable timing of the bang sometimes pushes the cylinder the wrong direction or interferes with the turning of the crank. As a result, the engine stammers or backfires, if it runs at all.