I have a 2005 Silverado 1500 with 152500 and am currently having what I believe to be an electrical problem with my transmission, when in drive it acts as though it's stuck in 3rd without overdrive and at the same time it can be described as being stuck between gears, when addicted manually it worked just fine, the check engine light is on and read as a problem between 2nd and 3rd, already tried adding seafoam transmission conditioner and have been suggested to check electrical ground, has anyone had a similar problem?