OK so I need my car to move forward when you press the f arrow but every time you change the pan of the car,
the y of the car remains the same and it moves forward on a different angle.
I have heard and researched ang_rotate but it hasnt worked for me yet any solutions...

don´t use my.y+=blabla. Use c_move. Look into the manual

Tried C_move and the same problem remains. Any ideas anybody how do I get this to work...

Post your code.

This is my code for the c_move part.
if(key_cuu) c_move (player, nullvector, vector((50) * time_step, 20, 0.1), IGNORE_PASSABLE | GLIDE);
Then once I change my pan it keeps going in the same direction not in the the new direction I just turned towards.

c_move(ENTITY* entity,VECTOR* reldist,VECTOR* absdist,var mode)

You see, the second vector argument is the amount of absolute movement. You are looking for relative speed (relative to entity's orientation).

if(key_cuu) c_move (player, vector(50 * time_step, 20, 0.1),nullvector, IGNORE_PASSABLE | GLIDE);