Oh yea.. if i pull the thermostat will it mess with the computer?..

hey i have a 3.4 also and i fighted the overheating problem for a while. it took my girlfriends dad and i changing the intake gasket. and then it took a local corvette specialist to change the timing cover gasket and a new fuel pump, since all of that happened i haven't had a problem since.

Update
 

Well... I took my car out last night ran it.. seemed ok.. got up to 230.. then it would drop down to 210.. not a problem for about 50 miles.. Went to school today.. again no problem.. came home.. same thing.. then I had to give my roomate a ride to work and bam... right up to 260.. i could hear the antifreeze boiling in there ... i cant figure it out...

j/c where you from in mn?

are you blowin smoke when you start your car??? and are you sure your water pump is OK

Nope.. no smoke... water pump should be good?.. i had it replaced two summers ago when this problem started... But I found a motor here in the area with 16k for $1000.. i dont think thats too bad of a deal.. and im in Duluth MN