I went to start my car the other day, and it kept dying. Thinking that the power valve might have been blown, I took off the front bowl, removed the power valve, and did the "can I blow through the diaphragm test" I was not able to blow through it, so I figure that's it is good. I have not adjusted the timing or changed out any of the jets. I put it all back together, and it still will not idle. If I let off the gas it dies. It is also backfiring out of the exhaust. Perhaps I need to go from the 65 to a 45?