Engine will rev like its got full power in park. However, in drive the acceleration is very slow. Engine came out of running vehicle that was running perfectly. Already replaced the computer and wiring harness.
Do you have CVT trasmission in your Caliber? If so, it may be the root cause of your problem. There is an oil pump in the transmission that controls oil pressure, which in turn controls pulleys. And this pump is the most common failure in these transmissions.
A dirty or clogged fuel filter is another reason for a car not accelerating like it's supposed to when required to do so. With a dirty fuel filter, the engine won't be getting enough fuel which means that the vehicle won't be giving the acceleration performance that it should.
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