Ok going down the freeway at 80 with the cruise on all of a sudden the speedometer drops down to 0 and the cruise kicks off rpms dont move much but go down i push the gas and it barely picks up speed then i floor it and at about 70 i floored it and it didnt down shift just booged as the speedo went to 0 again. I get off the freeway and from a stop i hit it to see what its going to do and it revs all the way out but doesnt shift, i let all the way off and it shifts, i get to the next stop light and take off normal and it starts and then like goes into neutral so i go into a parking lot ******. I go get something to eat and decide to try an make it to my garage, the whole way over there it does great. The next day i go to start it and it starts and turns back off so i try again and it turns over real slow so ilet it sit and it starts right up. Now all the time accelerating usually over 70 the speedo will drop and shoot back up alot, keeps throwing the system too rich code. Replaced rear bank of coils and the fronts are soon to come. I know the tranny is not going so i think i have a electrical issue, any advice helps. Thankyou