If there is a glitch (flat spot or drop out in the resistance) it's bad and usually it will be in one spot only. You do have to move the throttle very slowly and you may have to try several times to catch it. When they get really flaky they will set a code but if you have a stumble from a bad spot on the board it won't. Fixing EFI can become expensive fast if you throw parts at it so it's best to be sure the part you are replacing really is bad.
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