My 1993 Lexus GS300 will not start because it is flooding with gas. I am able to restart after letting it sit for a long while. It runs fine for about 30 secs, then starts to miss, then dies and I am unable to start it again until it sits for a day or two. It throws a ½ in spark at the distributor, and a vicious spark at the plug. When it dies, I pull a plug and it is wet. When I look into the cylinder there is liquid gasoline sitting on top of the piston that I am able to suck up with a syringe. Any suggestions?