How does the Car Idle?.. Stable? Does the Car Pull past 3K at WOT without Stumbling?.. Is the Stumble only at Partial Throttle or Full? Z's can have a CAS Pin Alignment Problem.. This will cause a Drifting Ignition Timing.. A timing lite should be able to see it. My Favorite Solution for Issues is to use Conzult Software and have a look at what the ECU is seeing.. Cj
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