Rodeo engine light on
 

Hi need help please when i drive my rodoe ra lx 2004 3ltr diesel crewcab at 100km or more the engine light comes on and it loses power for a few seconds.
i put my foot flat to the floor and the engine light goes off and i have power again.
A at high speeds it surges a bit every now and then.
Driving under 80kms it has no issues other than turbo lag . How can you fix turbo lag also.
If anyone can help me out with some suggestions I would really appreciate it
thanks
Tab