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hey so i recently finished rebuilding my rear end in my 300. it has had the carb rebuilt fluids flushed new tires it was ready to go so i thought... i went to take her on its maiden trip out of my driveway and as soon as it went fron nutural to high it died.. i started it up again tried low dead.. reverse dead.. it will stay running if i work the gas alittle but eventually dies like its starving for fuel almost?.. any help you guys can offer?? i did a vaccume test aswell with starer fluid
thanks allot
-Garrett

this is driving me crazy!!

Some recent detail history of maintenance of the fuel and ignition systems would be helpful to diagnosing what might be happening. Pretty hard to speculate with so little information.

Didn't mention the car's history and how long since it was driven. If you can rule out ignition and a bad carb rebuild, several have had issues with clogged fuel filters, debris floating in tank which gets sucked into a position to block gas flow and deteriorated rubber in the hoses and fuel pump caused by modern gas.

i just noticed if i keep nursing the throttle i can get it to shift and run in gear. it will idle in high after a few shots of fuel, it will idle in low for less time but still dies in reverse almost instantly unless the throttle is fullo open haha. theres new plugs n wires, the cap needs to be replaced but looks alright the points could use changinh but not urgent.. the cars history to me is unknown for the most part.
sorry for rambling and thanks again

would clogged fuel be a factor when it idles and revs fine in park?

If you can rev the engine to a decent and sustained speed without it dying, probably not. If it dies or starts to stumble like it's running out of gas when you run it fast for a bit of time then possibly. If the carb is not adjusted well or the idle is too slow, that could cause issues when a load is put on the engine.

its not fuel i domt think maybe vaccume? how would i test otherwise? is there a carb ajustment i should check?

To me, if it only dies when you put the car in a gear. Then there is an issue with the transmission. Perhaps the lockup clutch is stuck engaged or something similar.

i see where information might help... it has an aftermarket electric fuel pump and i donmt think all the vaccume lines were put back correctly.. im not sure im trying to find a reference