Sorry guys im back again and could use some help..

Ive had this problem problem b4 in the past but after i put some radiator stop leak it went away till now that i did a flush. Now its back and worse then ever, wats going on is when i usually hit 60mph or fast acc on the bird it missfires till i restart the car wich is a pain in the but when ur on the road having to restart the car in neutral.

could use some 2 cents on the problem..