Windows 7: Counter Strike is the only game i get Ping (Please Read ty)

I have read someone elses topic that had this 'Kind' of issue but that didnt seemd to get answered by anyone. So just wondering. I'm getting very high Ping Spikes in CS:S and i dont get this in ANY other game. I sometimes play CS:S then go play Counter Strike:Global Offensive and ill be lagging in CS:S but not in CS:GO.. Whats up with that and anyone know a way round that?

P.s i've already tried turing off the AUTO TUNING Like ive seen in other threads.

Thanks please get back to me.

Is it just certain servers, or all servers? You may also have to open some ports for CS:S.

All my ports are open :P. Yeah on all servers =[

Are you using a router AND a modem, or just a modem? You'll probably have to open ports in both hardware pieces. Though I don't think that it truly matters, but I'd open ports in both, if you can.

Using a router only. I'm DMZ so surley thats opened them all.

So i take it there is just know reason for this?