I have 98 GMC 350 vortec, had to replace intake manifold (cracked). I timed it like the old 350's and it seems to run ok. Check engine light is on so i scanned it and am getting cam shaft / crank shaft correlation problem (P1345) I set #1 at tdc on comp stroke and set rotor at # 1. Is there a special way to time this motor? Thanks for any help.