idle is good, driving is rough

[bigeric73SE]

got the 360 up and running, idles very clean.  No problems when reving it up either.  I put it in gear for the first time a few days ago and backed it out of the garage...started driving up the driveway, throttled it a bit and it bogged down and wanted to die.  Put it in neutral and it idled fine...
When i put it in gear i started rolling and punched on the throttle to see if she'd move...well there was no power.  Just loaded up but didn't move.  Any ideas here?
Thanks
Eric

[68chargerboy]

it may be the piston/servo in the trans our a bad torque converter

[70charger_boy]

pull out each of your plugs to see if they are firing.  sounds like your running on 4 cylinders