99 E150 flashing the overdrive light on the shifter, any idea on what is causing this? Sometimes the tranny skips from 1st to 3rd, then realizes it belongs in second and goes to second, but its very rare the tranny does that. Otherwise the tranny seems fine. Also the van gives itself gas at random like I'm hitting the pedal when I'm not. It usually does it when its stopped and I open the door, but sometimes it does it when I approach a red light and well that makes for a scary moment. If I disconnect the battery and let the codes reset I buy myself about a thousand miles before these issues start back up. The throttle position sensor was replaced when I bought the van about 35k ago and the revving/gas issue still continues. When I bought the van 7 or 8 months ago it threw several codes with inspection and after $900 in repairs it still didn't pass and I had to get a waiver to tag it. It was the heated catalyst, EGR, and O2 sensors and the codes still threw after all were replaced. Could I just need a new computer? I miss my chevy!