1

Which one is correct?

  1. I'll come by looking for you.

  2. I'll come looking for you.

If I don't use preposition 'by' will it be fine?

3

Both sentences are both grammatical and idiomatic, but they differ slightly and in meaning and in tone.

Merriam-Webster has an entry for come by, showing that it's is a phrasal verb:

come by to make a visit : came by after dinner

So your first sentence implies you are meeting at some prearranged place (it could well be the other person's residence, but it might also be, say, a bus stop or the person's place of work):

I'll come by around six o'clock; be waiting on sidewalk and I'll pick you up.

Your second sentence could mean the same thing, but it also could be used in a more ominous way. Let's say I found out someone had been sleeping with my girlfriend, and I wanted to exact revenge. I probably wouldn't say:

I'll come by looking for you.

because come by suggests a cordial visit. Instead, I'd be more likely to say:

I'll come looking for you.

because come looking implies some kind of search. In that context, it's almost suggesting: "You can try to hide, but I'll find you anyway."

In the movie Taken, actor Liam Neeson doesn't tell his daughter's kidnappers, "I'll come by looking for you."

To answer the question in your title: no, a gerund does not require a leading preposition. Whether or not a preposition should (or could) be included depends entirely on the verbs used and the surrounding context.

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