Mechanics

RUNS ROUGH/ NO POWER

1995 GMC Sierra • 168,000 miles

5.7 liter runs rough. Replaced starter, altenator, spark plugs, wires, dist cap, rotor, throttle positioning sensor. Back fires out the throttlebody. Right exhaust manifold runs red hot. No power
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Joe lippert
December 28, 2011.



Here are some links to some walk through diagnostics that cover every symptom you describe.
Here are the links;

http://www.2carpros.com/articles/engine-misfires-or-runs-rough

http://www.2carpros.com/articles/engine-backfires-while-running

http://www.2carpros.com/articles/engine-has-low-power-output