2001 3.0L auto. has 2-3 shift issue only when started and immediately driven. shifts out of 2nd but will not engage 3rd (like put in neutral). engine revs and have to burp thottle to get to shift. will only happen about first 30 seconds of driving. one or two shift cyles. then will not happen for sometimes weeks. no codes. trans re-built. new pump, converter, valve body, pcm. all oem parts. found pcm update but assume has latest software when pcm was installed. stumped in ohio?