The misfiring and stalling shold not be caused by the accelerator pump.
1. Check the spark plug condition and gaps. Seems it is running rich.
2. After engine has warmed up, back off the idle adjust screw till the idling speed is lower than 750. Turn screw in to adjust it to 750.
If you are not able to lower it to less than 750, some other linkages or vacumns could be stopping the throttle and this would cause the engine to stall during abrupt closing of throttle.
3. Check throttle spindle for side movement. If there are wear on the spindle, it can result in the throttle plate closing eratically and disrupting the idling.
With engine idling, try to push the spindle sideways and check if it affects the idling speed.
4. Check the dashpot operations.
Our database does not have any information for your model as it is too old so I am not able to get you any additional information.
Hope the above are helpful.
Sunday, April 11th, 2010 AT 2:40 PM