Your message sounds very different than the title. If it is a cold starting problem turning off an on the cold start valve would not prove much. . . except that the cold start valve may not be working! The cold start valve is needed to enrigh the mixture before the engine heats up to keep it from dieing. This sounds like your problem. Now to confuse matters more, I had the same problem after my wife ran out of gas. I put in about a gallon and had to really rev the car to keep it going for quite a while despite the car being warm. This was because air as trapped in the fuel line. It took about a mile of driving, gunning the engine for it to clear up. Could also be the transfer fuel pump causing this problem too (the one in the tank), especially if you have good pressure (for 5 seconds only), the other fuel pump (drivers side near rear) may be fine. Can you gun it and keep it alive longer than 5 seconds or is that it? Need More Data (NMD).