Car wont start was starting engine light on guages jumping stall when driving

I would suggest you ask a local mechanic to have a look as i suspect a faulty computer but i have no pratical experiance with this american car ,now with my head under the bonnet i could no doubt have some idea but iam at a loss here as this is obviously a GM product which is a opel here in europe and iam wondering if this has the same siemans ECU as our cars and if it does then these age vehicles always have problems with this ECU ,its starts like you said with all the dials going right over then eventually it starts missing and throwing up all sorts of codes and the cause could be a simple as a coil pack shorting out but it damages the ECU big time but i could be totally wrong here and its completely different which is why i would advise you to ask a local man who works on these cars .