I'll start out with a little back story. I have an N/A 3800 in my monte carlo with 193,000 miles. Last week I noticed it had a slight miss that was intermittent. No service engine light at this time. It would come an go mostly when the car had light load at a constant rpm like on the highways and once in a while when leaving a light. Today on my way to work it go a little worse then at about 70 is just shut down at least 1, maybe 2 cylinders. The service engine light flashes constantly, it sounds like a subaru and the exhaust smells terrible. Any ideas?? Coil pack? Any way to test the coil packs other than pulling wires?