87 tbi

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I've got an 87 that's all stock as far as I know. I've got some questions regarding the computer and tbi. What all does the computer control? Just the engine? I'm just thinking along if I were to replace the engine later down the road what are my options for horsepower. Not alot of horsepower, I've got other cars for that, but just to add to it. Do I add an aftermarket throttle body and remove all the factory stuff?

Where can I learn more about the 87 throttle body?

Thanks in advance for any help.