I have a 1998 chevy ck1500 with a 4.3l vortek and 4l60e trans. Driving to work one morning the trans acted like it popped into neutral, when I got below 50mph it went into third and stayed there. I could manually get second and reverse but no first or fourth. Also the check engine light went on. If I shut the truck off then restart it drives normal for a few hundred miles then it happens again. I checked the code and it came up "shift solenoid B electrical circuit". I replaced both A and B solenoids and it still does it every couple of hundred miles. took it to a trans shop and they think it might be the computer but not sure.
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