2004 auto trani C5 convertable when you put in drive hold the brake and rev the engin it misses you have been told that there is a free rev limiter in the 2004 everything else runs fine do you have a?

Misfiring "under load" is often an indication of problems with distributor cap, rotor, sparkplugs, plug wires or burned valves, depending on which apply to your particular engine..