Just found out the throttle position sensor needs to be replaced. By the way, mdwyer, you were right, it was the speed sensors that were replaced last summer. Is it possible the TP sensor could have been damaged while replacing the speed sensors? Are they located near each other? They haven't told me how much I will be charged, even though the TP sensor all of a sudden stopped working when they were replacing the speed sensors I'm sure I'll get charged something for all of this. By the way, they charged me about $400 for each speed sensor. Does anyone know if this is a reasonable price? Thanks!!