One thing that I would suggest is going out at night time and starting the car and open the hood. See if you see any of the spark plug wires sparking. You could have a bad plug wire. Another thing that you could check is a fouled plug. Or maybe the points are getting worn. It is very hard to diagnose problems without seeing the vehicle. But from what you describe it sounds like an ignition problem.
It is very likely the Exhaust Gas Recirculation (EGR) valve is the cause of this, disconnect the vacuum to the EGR valve and if the stumble goes away replace the EGR valve vacuum delay valve, or thermal vacuum valve, I was a Ford Tech for years and the EGR was a problem on this engine. Below is a picture of the EGR valve and the vacuum delay valve, the parts are avail in the aftermarket from parts stores like Napa and Carquest.. 1st is thermal Vacuum valve for the EGR, next is the EGR valve .
There is also an in line vacuum delay that i used to install to cure this, contact ford dealer on this, u want the Black and White valve, it stops the EGR from opening for 3 seconds and gets u past the stumble problem, to install just cut the line to the EGR valve and sandwich valve in line, it is marked with a direction arrow for vac, it may say "Distributor" on one side that side goes towards the EGR valve Below is a picture of a typical vacuum line delay valve from Ford.
The early opening of the EGR valve will cause both symptom's, i suggest you buy the in line 3 second black and white delay valve I mentioned, it is the fix i used for the problem while working for ford dealer
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Thank you very, very much for the input. I will apply your solution this week. One last question, though. I have a related problem that occurs when I come to a stop. As I pull away the engine will stall. Could this be the same issue, or am I experiencing 2 seperate problems?
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