Random misfire on cylinders 1,3,AND5 WHAT CAN CAUSE IT

I was not aware that Caddys and Saabs share the same engine. Although, I do know that 3.0L Saab V-6 is a GM engine that Saab did minor adjustments to(at least that's what they told us at Saab FTP). Saab used a slightly thicker head gasket to lower the compression, added a turbo, altered the intake and exhaust manifolds, and added Direct Ignition with a "Trionic" ECU.

actually the Cadillac catera is an opal product not a saab, it is a rebadged opal omega.