I used my pressure washer once a little over a year ago, I had old gas in the unit.I have drained the old gas from the tube connected to the on/off petcock valve.to no avail,changed spark plug and sprayed tbi air intake cleaner in the piston chamber attached the wire to spark plug,pulled cord.unit would start then shutoff,repeated after releasing the pressure from the hose,again would start,but would shutoff.