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I have a very similar problem. I had the same thing happen a few years ago during a rally. the car would lose power and run real flat for a while, then suddenly perk up and run normally.
I have just re-sealed my engine and had the injectors rebuilt, but the car is very flat with a rough stumbly idle and no power. Once when I was testing out the latest fix. the car perked up for half a second and pulled strong, then went back to low/no power. I checked all the connections in the DME and relay, all of the plug wires are firing, the distributor seems to be positioned correctly and I changed the terminal ends from the DME to the battery, a couple of which were corroded.
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