Ok well i recently bought a chevy malibu (98) and it has a shake problem the guy said it needed a tune up so we gave it one and it got better but it still does it, The car shakes but only enough for the passengers to feel it theres no shots or nothing coming outside the exhaust it just shakes. When the heater is on it will eventually stop and it will drive and stop perfectly. I also need a new catalytic converter but i dont think or know if that affects it or does it? its also a 4 cylinder
