[nj85z28]

thanks guys. ive been over chevy thunder quite a few times since ive considered doing and after the swap. he pointed me towards the ESC, knock sensor and egr all checked out. i did have a fuel pump issue a while back which was corrected, but i will change the filter and check my pressure again. also i will pick up a can of fuel injector cleaner. i have been running 93 octane. Im pretty sure the base timing is set by the ecm so perhaps that can be an issue