Thread: Stumble At Launch

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Help. I am running a 426 HEIM in a 70 CHallenger and have a problem with serious stumble comming out of the hole after the car has been warmed up for about 30 mins. Runs great at highway speeds and durring the first 30 - 35 minutes. I have replaced my MSD6AL ignition and re-located it in front of the rad support to keep it cool, replaced the coil, checked for fuel delivery and I still have the problem. The only thing that I have not replaced is the distributor. Does anyone out there have experience with "fuel percolation" or any other ideas would be helpful. I am running a Stage V 2X4 intake and 2 X 650 Thunder Series Carbs. HELP ME !!

Dave

mechanical or vaccum secondaries? you could be dumping too much fuel at low RPMs/speed.... at a launch you could still be high enough rpms but be drowning the motor because the air is hotter at a stand still... so its thinner, and the carbs cant such in as much.... just a thought

Could be vapour lock. An electric fuel pump back at the tank will fix it, and any other fuel supply problems.

that was my first thought.vapor lock