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Sounds like the car is firing on 5 cylinders...mine will run smooth enough on 5 to do what you describe.
Start basic: fuel filter, make sure all injectors are firing, check all the plugs to see if anything is fouled.
Make sure the throttle gets fully open. Incidentally, the black plastic switch on the side of the throttle body is not a throttle position sensor, it is just a rotary on/off switch to tell the DME its at full throttle and the DME then ignores the o2 sensor. The Bentley manual describes how to test and set all this. When I first got my 3.2 years ago I thought it was a TPS too, but it is not.
If all else fails get to a shop that can stick a wideband o2 sensor in the exhaust and find out what's going on.
Your SW chip is not the problem. If the car is stalling occasionally you have something else amiss.
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'84 Carrera Coupe
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