Cryo did stage 2 tune on my car, always had ongoing issues with the tunes, irregularities on log data, inconsistencies etc, not once did I think it was Dave's fault - just felt there wasn't something quite right with the car.
So my latest service, mechanic calls says plugs are completely shot and look like they had never been replaced and looked like original plugs from factory. After losing my rag and asking why the f#%k this hadn't been picked up in previous services and receiving a mumbled response... my question is to what degree (no pun intended) would poor plugs contribute to the etune and/or performance?
I would think inconsistent feed back would certainly be a factor, but by how much? What symptoms would you expect during a tune with crappy plugs?