Hi,my truck idles normal as soon as it reaches optimum temperature it begins to miss on top gear continuously .When I switch the truck off and wait a minute then restarts the engine miss is gone as soon as I drive it an it reaches 70 or 80km it comes back.I had the head stripped engineered and found 2 cracks which we had repaired an re fitted but still the miss is there.iv tried numerous mechanics even the agents they cannot find the fault.It just doesn't have the power uphills and battles with this miss.Please assist.email: [email protected] thank you nasser