Hi im new to this forum. I just picked up a 99 eclipse with the 420a. it was overheating when i bought it so i replaced the thermostat lastnight, and after letting the gasket sealer cure for a bit i was going to start it to burp the system of any air. Went to start and it sputters has very low idle and motor shakes. I tested the coil pack and it tested fine. the plugs are new and i pulled the spark plug closest to the passenger side it had unburnt fuel on it.