my son is having the same problem 1990 camaro and wont start turns over spits but wont start....did you find out your problem yet?? when your 3.1 it at tdc #1 piston is up so is #4 piston ...number 4 pistion is in firing ..so dont think you #1 piston should fire...i changed timing chain, cap, roder ,coil ,plugs and wires..if you have any help let me know