Here are some better options:
* "I'll give you a call." This is the most common and natural way to express the intention of calling someone in the future.
* "I'm going to call you." This is another way to express the same intention.
* "I'm calling you." This is used when you're actually in the process of making the call.
The original sentence is grammatically correct, but it sounds a bit odd because it's missing a modal verb like "will" or "going to" to express the future tense.