Ford - Explorer :: 2005 - CEL - No Code - Blank Odometer - Trip Counter On Cold Start?

I have a 2005 Sport trac, just recently, I started my truck and my check engine light was on and my trip counter and odometer went blank, not off, just dashes going across the panel. I recall noticing that my rpms were a little high. I turned off the truck and restarted and after a few minutes it came back to normal. Check engine light went off and my miles were displayed again.

A few days later, it happened again, except this time the rpms were normal, just the dashes and check engine light. I happened to have an obd II with me and I immediately scanned it for any codes. NONE. Few minutes later, back to normal. Scanned again, NOTHING. Its been happening more frequently now, every time i turn on the truck when its been sitting for a while. Like I said, it takes about 3 minutes or so and it goes away. Nothing unusual happens during this time. Motor sounds fine and runs smooth.

A friend who is a mechanic told me that it could be a ground cable for the COIL? that could be loose or damaged? He said its more than likely a ground because it happens when its cold and takes time to warm up and goes away. That if it was a hot it would happen all the time. I have searched online for something similar and have found similar problems but no exact match. I just changed the motor about a week ago. I had problems with the timing chain and broken oil pump.

Due to the amount of damage, cost and time to repair and amount of miles on the truck (180K) I decided id be better off putting in a new(used) motor with 67K miles in half the time for labor. I dont think this makes a difference though, because the first incident happened about a week before the truck broke down and the second about two days before. So Im guessing that the change of motor has nothing to do with it.