I had to make a long trip with my vehicle and it was a real torture. It was not able to climb slopes, stalled every now and then, jerked and even consumed way too much fuel. The IAC valve, coil, spark plugs and its wiring and both the crankshaft and camshaft sensors had previously been replaced. All the new pieces were original ones, so the mechanic did not understand what was happening. After that, I asked him to show me all the vehicle's contacts, bought an electrical contact cleaner and proceded to clean one by one. Since then, the car has been working without any problems.