Car running great until I slapped on some pacesettler mid-tubes. Already checked for exhaust leaks found none. Changed out my front 2 o2's, changed the spark plugs and wires. Changed the waterpump and opti about 500 miles ago. The tranny doesn't want to shift during WOT. and only during WOT. well anyways I was thinking of changing the TPS but didn't want to work on it. I have it at a buddies shop right now and hes taking a look, Would headers constitute a dyno tune? Thanks.

 

No they do not. You took headers out, and put some new shiny ones back in... Retrace all your steps, I'm sure you are missing something... maybe some automatic guys can chime in.