Does it idle high also? i've had that problem, when i start the car (same as yours) it idles at 4.5rpms and after twenty minutes of driving for some reason goes to normal, i was told its a rpm sensor problem. good luck.
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How many rpm's is it running at when you first start it up and it is running on the choke? Does it gradually start to idle back and then start to die r does it do it all of a sudden and dies?
When running with the choke on, it is on the high idle circuit of the carb, as it warms up the idle should slow down and then idle in the 800 rpm range in Park, 650 in Drive. This will be the low idle circuit range. This transition inside the carb will cover an idle air bleed hole in the venturi of the carb and lean out the mixture. If you notice that the carb smells gassy and black rich unburnt gases are coming from the tailpipe, the problem is located within the carb and requires a carb tech to do a rebuild of the carb. You could try a good carb cleaner like Lucas by putting it into the gas tank, in case you just got a bad tank of gas, but that is just a bandaid for a more deeply rooted problem. Get the carb rebuilt?
Maybe a sticking choke or binding throttle linkage. Have you lifted the aircleaner cover and looked down carb opening? Choke stuck? Could be a simple idle speed adjustment also. What rpm's do consider to be high. Maybe some carb cleaner down the barrels and throttle linkage could free it up. Again, it could be a simple idle adjustment depending on RPM's it's turning.
It sounds like the Idle Air Control Valve is stuck. This will give you a fixed idle it can stick at high idle or low or anywhere in between. If you take off the air cleaner you see where the air is getting sucked into a small slot or hole. spray some carb and choke cleaner in there let it sit for about 5 minutes then start the engine. spray a little at a time with the engine running till the idle comes down by itself. This should take about 2-3 minutes. If it wont come back on its own take the 2 torx screws out and remove it clean with carb and choke cleaner and replace. If it still fails it will need to be replaced. MOST of the time cleaning it will work
Believe it or not I used to be a mechanic for chrysler. There are a couple of things to look at and I'm sure you'll find the problem. #1 is to check for any vaccuum leaks in the hoses and the intake manifold.I do this by spraying carb cleaner in little spurts towards a specific area and listen to see if the engine rpm raises while it is running. #2 is a carb problem--Usually with the high idle solenoid (located on the Passenger side of the carb) or the choke. Check to see if you have power at the wires leading to the using a test light or a volt meter before you start it up. If you do have power then start the vehicle or have someone start it for you while you are under the hood and examine the choke operation. B4 you start it the vehicles choke should be completely closed. If it is, it should open as the vehicle warms up when working properly. If not working properly it will either stay closed and cause the vehicle to flood out or run rough and backfire or it will be open(stay open ) and the vehicle will not stay running unless warmed up for sure.# 3 It could also be caused by a combination of the high idle solenoid holding the choke open and then causing the choke to stick open.
The throttle body may need to be cleaned. Take off the induction hose to the throttle and open the plate. Make sure the vehicle is not running. With the throttle plate wide open, soak a cloth rag with carb and choke cleaner and work the rag around the inside of the body especially where the plate's closed position is. remove the rag and spray a small amount of carb cleaner down the throat of the throttle body. replace hose and run vehicle at 1500 rpm's for a few seconds. This should fix the idle. It should be idling at about 800 rpms.