At first, you had not specified high idle. This could cause firm engagement for the same reason, higher speed=higher transmission line pressure. You can decipher the engine light by pressing 'info' up, and the on/off button at the same time. There will be a segment check followed by ALL. You can scroll modules alphabetically using the info button. Find PCM? And press on/off to select it. Use the info button to get PCM CODES, and press on/off. Record codes and post them. This may provide a direction you need to pursue however, it does not mean the smoking gun. By that I mean the code may translate to some further diagnosis to reach the cause.
Saturday, January 9th, 2010 AT 11:04 PM