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losing power and stumbling after driving for 20 minutes

Huskie007

Huskie007

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383 with edelbrock power package, 770 street avenger, reduced jets from 70/75 to 64/68. Electronic ignition orange box, headers... starts and runs good.... after 20 minutes of driving its stumbles and loses power and dies... I place it in neutral and starts right up and runs for another 5 minutes... I can do that several times to get home.....

Help.....
 
Heat soak? Fuel could evaporate even if engine not overheating. Engine temp? Do you have to pump it or hold it to the floor on restart? Ambient temp?
 
Clogged fuel filter or restriction in the line.

By the way, my gut says that a 770 CFM carb should not have 64 / 68 jets. Put it back to what the manufacturer put in when it left the factory. 70 / 75 sounds right, and if so, deviating ten sizes in either direction is way too much. Or put another way, if you need to deviate that much it's time for a carb that better fits your application.
 
Meep-Meep said:
Clogged fuel filter or restriction in the line. .
Click to expand...

+1. You can idle all day long with a partially clogged filter but once demand goes up, like chugging up a hill, the bowls will run dry. Its a good idea to run two filters, a coarse one (like a Napa/Wix 33270 125 micron) close to the tank and a fine one (Napa/Wix 33032 20 micron) close to the carbs.
 
I am just throwing this out there but is the fuel tank properly vented?
 
Where did you mount the ignition box? If any where near a heat source move it to the coolest location you can find.
 
I bet its todays gas and heat soak, do you have a insulator of any kind under the carb?
 
if it stumbles and dies,then starts right back up its a fuel problem.fuel pump,carb ,filter,many ways to cause it.start with filter and work from there.
 
mine did this last year and it was not fuel. Most of the time those resistors on the firewall quit all at once and I would always have a spare in the glove box, last year I had one that would cause the car to die, and after sitting 3-5 minutes it would start and I would limp home. I replaced it and fixed the problem.
 
I just went through this with my ride. Turned out to be "Fuel Starvation". I have a Fuel Pressure Regulator in line after the Fuel Pump and it was dialed down too low. Increased it to almost full open and the stumbling and dying quit. If you are using one then give that a try. As for the Orange Box? Get rid of it and go with the Chrome one. Better unit and mounted with a special mount that gets it off the firewall will keep it nice and cool....cr8crshr/Tuck
 
What ignition coil are you using? My Cordoba acted just like this and it drove us nuts for about two months, we finally determined that the "universal" electronic ignition coil was only universal on brand x and y cars not Chryslers which require a lower impedance primary winding. The car will run fine at first but the high impedance winding will slowly overload the ignition box and shut the car down.
 
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