Engine was running real rough and concluded #1 and #4 cylinders were not firing, however, #2 and #3 were firing. I thought that since there is 2 coils, that the coil was bad. But after replacing it, same problem. I switched the coils and still no spark to #1 or #4.
Could the module be bad? Would it make just 1 coil fire or is it the computer? Service engine light is on, but I am not very familiar with Saturns. Please Help!!