I'm having a weird problem with my Vitz (1000cc) for the past few weeks. Sometimes, when I start the car on A/C after a brief stop (of say 5 minutes) and push the accelerator, there is simply no revving and the car refuses to move at a greater speed than the naturally set speed for 'D'. When I say revv, even the engine sound of high RPM is not there. It's simply like I'm pressing a dummy paddle.
I got my Transmission fluid changed and the whole gearbox cleaned. I changed the pipes carrying the brake fluid since they seemed pretty clogged but this problem simply refuses to disappear. I don't have much idea about these things work but my hunch is it's most likely some issue with the Gearbox or perhaps the A/C...
I was about to get my Fuel Injectors cleaned but this type of non-responsiveness can't simply be explained away by clogged injectors. More importantly, once I'm doing 40-50 km/h, the car accelerates to higher speeds quite nicely with or without the A/C on.
Any ideas, with some logic/evidence are highly appreciated.