I have a 93 Riviera. Several weeks ago, intermitantly, the engine run like it had a bad plug. I replaced the plugs but discovered Cylinder
6 was not firing. I check the spark, change the plug wire, changed the plug again, still no fire on 6. Car has 97k on it. I do not have compression testor, so I have to guess as to the problem. Since it only has 97k and has been well cared for, I suspect an injector problem. Are there any tests other then replacing it and see if that fixes it? Thank you. Van