My car is Camry 2004. It runs well, but the problem is hard to start after sitting for few hours or longer. It took three to four times to have the engine start with gear pushing. i have changed the idle system, fuel pump, fuel injector, battery, fuel sensor, cold start sensor, ignition coil, and spark plug. But It does not get well, the problem is still unsolved.
After changing the spark plugs, the engine starting well for three days and then get back to the same situation.
Anyone could tell me how to solve this problem?