(Galant 1.8L GDI 4G64 engine). Accelerate on idle the engine power is ok. Can be reach 6500rpm. But when drive the vehicle loss of the power. Totally no pick up. Only can drive slowly. But just feel like something choke or stuck. Is it the exhaust coverter choke?But if the converter faulty. The engine wont be power full when I accelerate on idle. Right?Diagnostic with scanner. No fault code exit. Will be the auto trans problem?