Stop in for a cup of coffee

71GSSDemon said

I understand and agree about clean cut-off and coast to check plugs. For a street car it seems like bit should be an honest mix versus drag car. Idling vs WOT will show differently. Do you check idle. Then cruise. Then WOT and verify all are good for a balanced engine. I have fear that in their testing WOT could be perfect but idle or cruise lean. So, ideally, to me, it seems cruise would be very important check for a street car. I could be wrong

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I think we agree. The challenge with plug readings is isolating the conditions which colored the plugs. Honestly even with a data logger its been challenging isolating the scenarios. My approach is to blend the way it ought to been done, and what is most practical for me. For me that is idle, idle in gear, off idle to low speed crusise, cruising at 35 to 45 mps. if there's issues with accelerating lightly or moderating then I have to start over. It's just not practical or safe if there are issues with normal accelerating or going up a hill. Then check highway for drivablility but at this point my goal is to test WOT at the track or dyno. Then come back to highway cruise, transistions, and pump shot.