Problem with my 98 honda accord 3.0
 

So my car started to idle funny. Needle starts going from 1 to 3 multiple times when i push the gas pedal my car starts to slow down n try an stop do anybody knowns what could be

Have you had the OBD-II codes read yet? If not, then that's a good place to start.

i got the codes p0401 p0705 p1456

P0401 - Exhaust Gas Recirculation Flow Insufficient Detected
P0705 - Short In Transmission Range Switch Circuit
P1456 - Evaporative Emissions Control System Leakage Fuel Tank

so what should i do whats basically causing my vehicle to do stop an go

Any or all of the three could be the issue. Debugging Evap issues can be expensive, frustrating, time consuming, and (did I already say this?) expensive. The EGR and Tranny issues should be easier to diagnose and fix. That said, at this point I think you should take your car to a professional for diagnosis/repair.

the thing is i already replaced the EGR like 5 months ago an the tranny brought new

The 0401 on the v6 is usually caused by the "tube" in the intake being clogged.

On the 98-02 the 0705 is a generic trans code....leave the range alone for now.

The 1456 is going to be down to about three things in most cases....as stated testing would be needed to know exactly what is causing this.