My  2003 Chevy Tahoe truck has rough idle at idle speed. What causes that and what is the best
way to take care of it? And what is the best way to get more horse power without putting a lot of
pressure in the engine. In other words I don't want to kill my engine prematurely. Thank you.

There are several common things.

1. Upper intake manifold gaskets could be leaking vacuum.

Throttle body may need to be cleaned.

3. Possible injector problem, or leaking
fuel pressure regulator-leaks gas into the vacuum line.

4. Also, if it has not been to the dealer in a while, there may be a  PCM (powertrain control
module) update available. Module programming updates are released often.

Some help repair many different concerns with many different systems. Need to have the system
scanned to check for
trouble codes and view all the different parameters.
Added freon, cold on driver side, blows warm on pass side, now all warm
2001 trans has code P0753, no 1st gear, starts in 2nd. 1-2 shift solenoid
A few other Chevy questions.
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Chevrolet Tahoe 2003 Hard To Start