So I have an 08 Cobalt with the 2.2 L engine. I had misfires in #1 cylinder and loss of compression. Pulled the head off and replaced the following components: head gasket, head bolts, intake manifold, valves (#1 cylinder) and valve springs.
The valve job corrected the loss of compression in the number 1 cylinder. I still have misfired, but they are random cylinders. At stop or at idle, the car idles really rough and lurches when I accelerate again. Also been getting bad gas mileage. I already replaced the air filter and cleaned the inside of the throttle body? Any suggestions!? Thanks is advance.
The valve job corrected the loss of compression in the number 1 cylinder. I still have misfired, but they are random cylinders. At stop or at idle, the car idles really rough and lurches when I accelerate again. Also been getting bad gas mileage. I already replaced the air filter and cleaned the inside of the throttle body? Any suggestions!? Thanks is advance.