Dear KK: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.






KK:
There are several common things.
Upper intake manifold gaskets could be leaking vacuum.
Throttle body may need to be cleaned.
Possible injector problem, or leaking fuel pressure regulator-leaks gas into the
vacuum line.
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.

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