ok - I get 2 flashes, 2 flashes, 2 flashes after the code 12. I'm guessing this means code 22 which gm'* manual says is a TPS Voltage low. what does that mean and how can I fix it?

you'll need a scan tool or a multimeter. scan tool is easier. you need to adjust the TPS to a certain voltage. IIRC .45v is the sweet spot. Otherwise, if its not just out of adjustment, you might have a bad sensor. The way to check this is the same way you adjust it correctly. With a multimeter, backprobe the sensor and run the blade from 0-WOT positions. Make sure the operation is smooth and even. If not, replace the sensor.

thanks for the response. now I have to find my darn multimeter....