When troubleshooting a fiesty hot end, there are a number of underlying possibilities that may be giving you problems. We see it on the Tevo Tarantula Owners Facebook page often. Here are a few places to find some answers.
First, make sure you have the proper distance between the print head and bed.
Next, if your hot end is leaking, watch this video segment by Rui Raptor.
Finally, here is a document that shows you how to clean your hot end. This comes from the Owners group as well.
If none of the above works, there are some more great troubleshooting resources out there. These should help you figure out what is going on.