Re: car stumbles in the air!
Like many others who have commented, I'm not convinced that you have a carburetor issue. If I were you, I'd probably be looking for some of the electrical issues that have been mentioned.
But, let's look at two things related to the carb to see if we can begin to determine what is at fault. First, what is your fuel pressure? A good ballpark number for most Q-jets regardless of builder is 7 psi max. You will need to verify your gauge reading by comparing it to a second gauge. Typically, if a fuel pressure gauge goes bad, it will just give you an incorrect reading and make you believe it all day long. Also, do NOT use the little 1" or so gauges that screw into your regulator port for your fuel pressure reading, especially a liquid filled one. I have seen more than one racer chase similar problems that ended up being a faulty fuel pressure gauge. Your gauge could be showing 7 psi but maybe you really have 10.
Next, what size needle/seat is in the carb? I've seen too big of a seat cause more problems that it potentially solves.
These are obviously not the only two things to look at, but just some brainstorming suggestions as someone else stated. Good luck.
Dean
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