To reset the computer simply unplug the battery for about 30 minutes.
However, you have a different problem I believe. you need to check your plugs and wires/coil packs. A fouled spark plug will cause rough running at any speed.
My valve cover was leaking oil into the plugs, fixed the gasket and ran great. Now I can get it to run and everything is pointing to a crankshaft sensor. I looked at it and the oil had leaked all over the sensor. So now, I need to clean area and see if I can salvage the sensor. If not it will be costing in the range of $70.00 for a lifetime warranty sensor.
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Also check manifold vacuum at idle the best you can hold an idle. I have run into timing belt being one tooth off and engine still ran fine. But the vacuum was low that's how I could tell the belt was a tooth off.
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