I've been having an issue with acceleration mostly in reverse but it has happened in drive as well. The issue is that when I press the gas the blazer doesn't move. It revs up but stays in place. What is weird to me is that as soon as I let off the gas the blazer will move in the direction I intended the vehicle to move. This only happens after starting up the truck. Once I come out of reverse and into drive if it doesn't do it in drive I don't have a problem again until after I let the blazer sit turned off for a while.

Things to factor:
'Check Engine' light is on (I haven't hooked up the truck for readings)
New spark plugs and plug wires
This does seem to only happen on a incline now matter the degree.

 

look at the trans fuse see if its blown. then check for voltage, should be 12v. if not then ingtion switch is bad

 

Thanks for the quick reply I'll check that out and get back to you.

 

Check trans fluid, color, smell, get the codes read & post em up/look them up.

 

I had deja vu there for more than a few seconds mychevy!
Another thread we are part of was the same answer from you - trans fuse.
For a moment I thought the OP had another nic lol.

 

lol yea seems to be runnin alot lol