OK....so I have an 02 z28 with 103000 miles. JUST CHANGED THE PLUGS....so every once in a while I will run it and at 5000rpms it will sound like Im hitting the rev limiter....when clearly my limiter is set at 6600. I have a timing tuner which connects to the crank position sensor and I am thinking that maybe this is the problem. So I go out from 50 in second and punch it and boom rev limiter at 5000rpms. Go right back out again and its perfect climbs all the way up to 6600...What the hell is going on?????

 

it kinda does sound like a sensor

 

i have a timing tuner that connects to crank position sensor....u think?