Well it is my first time tearing a motor apart and putting it back together. I mis-adjusted a valve so I had to fix that, and I mixed up two of the spark plug wires (I need to go to bed earlier). Anyway, I got it running this morning and it ran perfectly. I drove it for a couple of miles and it started hesitating, then the check engine light came on. The code was 42 (Electronic Spark Timing). So I downloaded winaldl and logged the sensors while I drove around the block ( Excel File ). I guess I need to know how to test the ESC module before I drop $100 for a new one. If any of ya'll have any ideas I'm all ears /forums/images/graemlins/ears.gif Also, does anyone know a good website that explains what all the sensors do and what their normal operating ranges would be?