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my 940 now surges while driving 900 1994

I recently had serious problems with my vehicle dying for unknown reasons. I replaced the rpm sensor, fi relay, radio interference relay and power stage. I cleaned out the throttle body and reset the throttle position sensor, as well.
Now when im driving the car runs well, but it surges. the rpms seem to increase and little and go back to normal. mostly in the 2000 rpm area and 3500 rpm area. The car also seems to have little power in the 1500 rpm range, sort of stumbles but if you accelerate a little harder the rpms rise and it has normal power. Well if anyone has suggestions they are extremely well appreciated. Thans for all the previous help too, guys!

Thanks in advance,
Fred






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