you can try this, i found it at
http://www.dsmchips.com but they are TMO instructions, i personally wouldn't try it myself my soldering skills are weak
1. Clean off as much of the conformal coating from the TOP and BOTTOM of the EPROM with acetone, or fingernail polish remover.
2. Add some fresh solder to each pin before attempting to unsolder it.
3. When you have unsoldered all 28 pins, grab a whole row of 14 at a time with a needle nose pliers, and wiggle them. This will help snap the leads loose from the holes in the board, making it easier to remove the EPROM without damage to the ECU.
4. Slide a small screwdriver under one side of the EPROM and slowly work your way across underneath it, wiggling the screwdriver back and forth a little as you go. If you feel a lot of resistance, or see the circuit traces are vias start to pull up, STOP, Figure out which pin are still hanging on, and try cleaning them up before proceeding.