Engine problems

I would try changing the crank sensor first before messing with the timing. I changed mine on my cutlass supreme it was located on the side of the motor that is closest to the firewall I dont know which side to call it but it was kinda farther down the motor. Just picture if you followed the crank across the motor. I had trouble reaching it. I had to take the coil packs and ignition module out to fit my arm down there. If it wont come out try and spray some WD-40 around it to slide it out