no power after 3800 rpm

i have a 91 da with a 97 gsr swap in it. build bottom end with port polish head n valve work.garret 3075 trubo 685 injectors unorthdox pullys nology hot wires MSD ext coil rotor n cap. the car was finisn few days ago.but wen we put on thr dyno it made crazy power up til 3800 rpm then it start to lose powe.anybody have any idea what the problem might be. thx p.s we play around with the timing a bit but it didnt help

a/f’s?

no we check that. now we think is computer related

wow out of all the super knowledge people on this site one person answer me:shrug: sorry im tuning with hondata s300

Check cam sensor in Distributor.

will do thx

the guy said it has to do with obd0 and the resistor box not sending signal to the injectors.does it sound right ?