pyro_racer_0016

put new mazda reman in got it past breakin and went to tune it at 5200 it cut out bad. on the first run it went a little lean from 11 to 1 to 14.1 to 1 and we added a bit of fuel and stayed at 11 to 1 even when it cut at 5200. power was at 260 at the wheels at 5220 and by 6200 it was at 40 at the wheels. we thought it was the coils since they were old replaced those and it still does it so i checked the injector wiring one of the connections came apart and i fixed it and check all the others but it still cuts out. It was drivable as long as u didnt' rev i under load. Under no load it will rev to redline without missing. so i drove it for a few days went about 30 minutes away was there for about an hour and drove back made it to about a half mile from home and it drove and boosted fine when kept under 5k and stopped at a light and went to take off and at 3k under 3psi it cut out hard and has since continued to cut out at 3k. What is boggling me other than what it could be, is why it went from boosting fine no less than a minute b4 on the highway and then suddenly cutting out at a lower rpm

mods are single turbo with power fc greddy profec b 1000cc and 1600cc injectors on a steve kan tune new coils 255 walbro pump and new plug wires and plugs

any ideas or help would be greatly appreciated as i have stewed over this for few days trying to find out what i could be i am replacing the fuel filter just for good measure and to keep my self busy and thinking i might stumble across something