I have a 2000 ford escort zx2?

It should get great millage but for some reason it feels like I'm not getting the power it should when it's in drive it idles rough and the rpm meter keeps jumping but when it's in neutral and park it's fine it also does it in reverse I jus got it an oil change and all new plugs and wires and new cool pak what else could it be?

Poor air flow. Clogged catalytic converter. Possibly bad belt/alternator. I'm leaning toward the converter though.

It could be a dirty throttle body or a dirty air filter.

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