Do not run the engine without the tps set properly. You will ruin the trans. The trans will be in the "limp home mode" and the shifts will be hard and painful. That neck breaking slap kills the trans. The design on this mode is to get you off the road quickly and safely. But driving it is not what you want to be doing. I too have been looking for the same part just to have a spare. I found plenty of them when I didn't want one... Now I can't find any... Go figure... I even looked at the mercs and linclons but no deal....