Engine Revs-up pulling away from stop.

[Chuck-H2]

COUPLE OF SYMPTEMS HERE COULD BE ALL RELATED, 1St I finally replaced the Battery. Now when I pull away from a stop the engine revs up to 2k rpm and slowly moves. as if it was in 4th gear. took the ( H-2 2005 ), to auto parts to read code and it said it was shift solenoid . Took car to Trans shop for servicing and to replace this solenoid ...While there they said it was in the -Key Ignition tumbler- now 2 times I had trouble turning the key all the way back to remove the key. The Mech said it was causing a low voltage signal and that was causing the trans not to start out in low gear from a start. QUESTION Could the ignition tumbler cause a low voltage signal that could cause the trans not to down shift? resulting in starting out in high gear at start. and 3 times now when I got home from work and went to turn the car off I couldn't get the key to turn all the way back to get it out...Why? ( AND of course its intermitting) Thanks in advance. its my 1st post