My 99 Z-28 M-6 has 75k miles on it. I drive it maybe 150 miles per week. I just today put my 500 miles on a brand new spec 3 with a new slave cylinder, pressure plate, flywheel, the whole shabang. I cant figure out a pattern, but, twice today, the car was in gear and the motor was reving, but the power seemed like it wasnt getting to the ground. It almost felt like a 3 or 4 spark plugs were fouling. This is the reason I changed my clutch in the first place. I have no problems putting the shifter in or out of gear, and like I said its very unpredictable. I can put the gas pedal to the floor and I can hear the motor reving and the tach shows it, and all of a sudden it will kick in and be fine. Shitty job of explaining it, I know, but I cant figure it out to save my life. If I spend anymore money on this car right now I will be sleeping in it!!!! You guys got anything?

 

Sounds like you have a severe running issue there.
Is the check engine light on?

 

no service engine light. I had the 02's tuned out and the knock sensor turned down a bit because of the cam. Other than the time its fu@kin up it runs like a raped ape.

 

hope you get it worked out Kenny. ttt for ya

 

I could understand if it was slipping but it sounds like you are just low on power, id look into your ignition and see if any plugs are fouled or wires are bad.

 

the problem is always the simple things, old plugs and melted plug wires.

 

hehe, told ya