Have 94 z28 rebuilt the lt put together went to fire cranks very erratic but won't start.Has compression,fuel and spark.I also checked to see if 180 out and had starter tested works fine on test rack but in car just spins starts stops plunges in and out.pulled away from flywheel same thing.Has new opti,starter,cam,water pump.to much to list.Can anyone help with this wall I have run into?

 

Are you sure you have the Opti splined driveshaft indexed correctly? Have you scanned it for codes?

 

thats a roger I thought that to maybe off a tooth checked twice.

 

have not scanned yet for codes.