Need Some Help

[Woodly]

So today I had my first problem with my skline. Regular driving, went for third, the car started to jerk. It surged so hard I was thrown forwards and back in my seat. Curious what was going on, I took it to a desolate street to see if it would do it again, and punched it. It did the same thing in first, after about 3500-4500 grand. Buddy of mine said it could have been water somewhere in the system being it's rained here a fair bit, but I ma not convinced, and not one to let things just try and sort themselves out. Any thoughts or ideas?

[gtst_type_m]

i had a similar problem, if your plugs are old the spark might be getting blown out when you hit higher revs, its a good place to start