Hey everybody. I have a 79 k5 blazer and when the truck shifts into second gear it acts kinda sluggish when i try to give it gas. All the other gears seem to work just fine so does anyone kniw what this means? I know some car stuff but nothing like this.

 

I assume that it has a TH350. It is possible that you have an issue with one of the clutch packs not unlocking properly and dragging in 2nd gear. How does the fluid look?

Does the engine have any vacuum leaks? The TH350 uses engine vacuum to control shift timings and line pressure (I think). If there was a problem with the line to the transmission it could cause problems.