Harassing amount of calls from the same entity as the 913-213-3207 number asking me to cash their counterfeit check.

called to pick up car that he payed with a fake check contacted me with the number 1-727-223-2888

He send me an email with the same about the check and stuff... He had a post on craigslist for work as house sitter.

Can you tell me what happened after you received the email? I RECEIVED one as well about a house sitting job on Craig's list. He said his name was jake and he would send me a check for the amount of 3000$. Idk whether he is a mask murder or legit. Please help

This is a common scam where they claim they overpaid you or they want you to buy something for them.  They send you a check, tell you to put it in the bank and then withdraw the funds to send somewhere by untraceable means (Greendot card, Western union, etc.)  You do that and the check turns out to be fake.  Then you are out the money adn you have to pay the bank back the amount of the check and any fees.  In some cases you could also be charged criminally for depositing that bad check.