My Alero is finally running again! It seems that we had to crank the engine several times for about 40 seconds. The compression came back after that. Now he has 10bars on every cylinder and it runs. After the first start he was running pretty bad until we realised that we mixed up the spark plug wires of cylinder 2 and 6
After we plugged them in right, the engine was running perfectly smooth! Glad to have my car back on the streets
Thanks to all here for the tips. May this thread will help someone else in the future who has a similar issues with the LIM Gasket/Head gasket problem.