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Does it only stumble on a hard launch? I had a couple instances where we had to do some fudging to get it to run right on the launch. On my nitrous car, I had a ten inch tunnel ram with dual 600's. It ran perfect, until I had to "launch" it. Then it would stumble as soon as the front end started to raise. A big block guy told me to run 14 psi in the fuel system to the front of the car to overcome inertia. I had a second regulator there to pull the pressure down to 8 psi. (dual quads and nitrous) That solved the problem on my car.

The big block guy had a similar problem and he found out the secondaries where running dry. He had a dominator with bowl extensions on it. The fuel would slosh away from the jets and dry up the jets in the secondaries. He wound up putting jet extensions on the jets to solve his problems. Granted, these cars are heavy hitters with finicky fuel systems, but just another opinion to mull over.
 
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