me and my friend both have ls's i have a 94 and he has a 98 we both are haveing problems we can both drive are car's normal but when we get on them is starts to rev but not really go anywhere.,ine olny happens when its warm or hot outside his is when ever he trys to get on it. i replaced my clutch kit, flywheel, flushed my tranny fluids and replaced them.its really only when we get down on them any suggestions? and both of them are 5spds.

thanks