1. Did you gap the plugs when you changed them?
2. Could be a wiring issue I believe. What was done to the wiring?
3.once again check timing and check the coils for any cracks. Even small ones can cause it to lose spark
http://www.miataturbo.net/general-miata-chat-9/how-install-bosch-044-fuel-pump-tank-intank-56407/
Seriously read this thing top to bottom including the comments and you will shit your pants.
Kids having fun. that's all this is. Don't let the ppl who wish they were 18 again bring you down. Everyone did their fair share of trouble and some got caught and some didn't. Just wish the camera man had a different angle lol