So this is weird...the car runs fine. It's a 2000 I30t. I say fine instead of normal, because normal for this car is...different. Regardless, I digress. It starts as usual, it idles as usual and runs down the highway just fine. However, when I try to accelerate anything above a "nominal" increase, it's almost as if the transmission cuts in and out. But maybe it's the engine? Either way, it actually acts as if a rev limiter is at it's limit (though it could not be anywhere near) and the car will not accelerate until I back way off of the pedal and then try to "sneak up" on it, accelerating very gently. I thought it was the transmission fluid level, so I checked it and added some because it was low. And it seemed to help for a while, but after two consecutive 600mi. trips, it's doing it again, and it seems worse when it's warmed up, not so bad when the engine is cold. Suggestions?