1995 corsica, 4 cylinder, 127,000 miles. when it starts the whole car trembles and it put puts from exhaust. I have had the plugs, wires and fuel injectors changed and cleaned. but the problem persisted. I then took it elswhere and they told me that it was a cylinder type thing that was bad and was effecting clyinder 1 & 4. That fixed the problem for a while, but now when the car isnt driven everyday it will once again put- put and tremble, but once I am driving it it goes away.