94' C4 with slight ping.

[kwajite]

Hi,

My first vette and it started to run rough hesitate. I replaced the plugs and wires and wala vette runs great. I took it out today and ran it on the freeway going up 280 runs fine (about 10 miles) I pull off to make a run back, I was in sixth gear (six speed) about 70 MPH just like the run up and it started to ping. Nerver heard this before, put it into fith and the ping whent away. Any thoughts? I pulled the codes no code were present. The only time it pinged was on the way back from my run in sixth gear. Around town no pinging.:confused

 

[93Rubie]

Did you have your foot in it when it was "pinging" or where you at a steady state cruise?

 

[kwajite]

Just a steady cruise about 70 Going up 280 no ping, coming back 280 all of the sudden ping.