car stumbles in the air!

[brett3533]

had similar problem w/quadrajet and found that i had left out the block off plate under the top of quadrajet. when i was on the dyno the carb functions perfect. put on the car and would almost quit running on the launch, the harder we launched the wose it got. who built your carb and did they even use one of theses plates they are not part of rebuild or stock equipped we used to use a peice of black electrical tape years ago but now mike mcdonald and danny ashley,at Q/jet performance rebuilds and enhances my Q/jets and he makes a custom plate that the rear meter rods fit perfect. the tape would be a quick cheap way to check,but it does not last. I am pretty sure this will fix your problem. if it does you may want to get in touch w/mike mcdonald or danny ashley. plese let us know if this works

[Tom Goldman]

I've seen similar problems when the fuel pump is not low enough in relation to the tank.
when the wheelstand is high enough the pump momentarly starves,and then recovers as the car falls out of the wheelstand.

[ron mattson]

I just went through the same situation, on my car it was a loose power supply wire in
my switch panel, it would lose power then get power and peck like a miss at the top
of the wheelstand after that it would run great.

[bob3240]

do you have the black tape on the secondary metering rod slots?

[TinSoldier 3215]

Bob, No.

[John Musial]

jonesracing you have a PM

[Alan Roehrich]

Got this from a friend and fellow racer, a really good racer. Check the fuel pump. There was a car with this exact problem, and what was happening was that under G's from the launch, the armature of the fuel pump would move and short out. It did not show on the fuel pressure gauge. They fought this problem all year, and a new fuel pump fixed the car for the last time trial at the last race of the season.

[Rusty Davenport]

This is for real......check the main wiring terminal for loose connections...check them with a wrench---not your hand......when I let go of the tranny brake the connection would momentarily lose connection then reconnect when it hit the ground off the wheelstand.......do not underestimate this happening, do not trust checking with your hand I say again....I felt stupid when I started replacing parts and found out a nut needed WRENCH TIGHTNESS.

[TinSoldier 3215]

Well after 3 weeks of Bad Luck we went to the track and found the issue. Thanks for all your guys help. It turn out to be the button!!!

[junior barns]

what button?