Shafts too stiff?

I feel like everything I hit is slicing, and while I know some of it is my swing, I was wondering if the shaft being to stiff could be the problem. A guy at the course gave me a R5 3wood with a stiff shaft for free and I can occasionally (1 in 50) hit it really well, but usually it doesn't have near the distance it should and goes right, same goes for my driver, it's an older titleist model that has a stiff shaft.  I am debating just selling them and buying a new driver and 3wood that have softer(?) shafts.  Also was wondering if too stiff a shaft could be causing me to actually lose distance on my clubs, because I believe my irons(bought secondhand) may be stiff as well. Thanks!

I was playing hand me downs that were stiff flex, and was slicing every club. I have since put together my own bag, with regular flex clubs and have straightened out a bit (especially irons)

I was under the impression that a stiffer shaft will cause the ball to go left and short with an inappropriate swing speed.

Common miss with a too-stiff shaft is right/slice.

This is what I was thinking, do you guys think it would be worth getting the clubs reshafted, or just selling them for whatever they are worth and then buying new ones with the right flex shaft?

both of those clubs are older....... If you like the feel of them when you hit them well, it MIGHT be worth it to re-shaft, but the cost of re-shafting will likely be greater than the value of the club. If you can afford it, look at something that's newer but used, or last years models, which are pretty much half off their "new" price across the board. I think you would likely see a huge difference if you got fitted for some new clubs, and like I said, you could get something like last years TM Superfast's for between $100-$150 each right now

No doubt about that, still in irons I prefer toooo stiff shafts, okay you loose a bit of distance, but the control of dispersion is great with too stiff irons.

I woods and drivers the low loft multiplies sidespin if you don't square the face at impact, so in these you better make sure that the shaft is a perfect match for you.

you can easily figure out your swing speed at a golf store  (golf galaxy, golfsmith). Going there and getting this info will give you a better idea of whether a stiff shaft is not appropriate for your swing. In any case, if this is not the case, making some swing changes would probably do the trick.