Welll I found a couple of cracked plugs that I changed and the motor revs clean now, BUT it just leaves really soft. My 60ft times ar .05-.07 slower with my 434 than they were with my 408 that made 100hp and 45ft/lbs less. I think the converter is bad, I have another one and I will swap it and hope it fixes it. Last race my et and mph kept falling off each pass, motor felt great and sounded great, I think it has got to be converter. Any other ideas??