the pickup was vibrating or a bit lose on the spark plu wire. I usually tension the the wire a bit so it does not lose signal due to vibration. i see that a lot on na cars with solid mounts. I usually zip tie the pickup wire so its slightly pulling on the spark plug wire. Also there are different ized pickus you can get for the dynojet. if you use the bigger on on the ptu loop it might drop out. i use the smaller pickup on the ptu look without issue.