I have a Lanos 99 and, in the morning, I am not able to start the engine because it fails considerably; the engine makes some explosions and it is powerless. After it warms up for 10 minutes, the engine starts properly and with enough power. Injectors were cleaned and the fuel fielter replaced, but everything remains the same way.

When starting the engine, it tends to stall. Once it warms up, it normalizes but, after a while, it starts accelerating and decelerating by itself; it does never reach a stable working. The fuel pump has been replaced, injectors cleaned and fuel filter, spark plugs, timing belt and even tensor checked, but the problem persists. Thanks for your help.