okay so i may have gotten to the bottom of the problem my car has had for about a year now. the car was shaking at low idle and i think that the mufflers might be the cause. the problem started when it would shake when i would come to a complete stop at a red light or stop and i would fix it by reving the engine and the problem would go away once i would hear a pop close to the driver side muffler. after a couple a months the problem got worse and the shaking wouldnt go away even if i did rev the engine. i did everything possible to get rid of the problem. changed plugs and wires, reprogrammed the pcm, got headers, deleted cats, and anything that would help the performance of the car. so i also noticed that the driver side exhaust wasnt sounding as nice as the passenger side. so i suspected that the muffler was clogged. people on the forum told me that i may have a hole in the case of the muffler. so a couple of hours ago i wiggled the driver side pipes and tapped the muffler. i took it for a test drive and the problem is still there but doesnt shake as much. it responds better and the shaking is still noticable but not so annoying. do you guys think that the muffler is responsible? the muffler are flowmasters and i heard people say that they run on luck, could last as much as 10 years or as little as 10 weeks. so tell me what you guys think.