It would help to know how many miles are on your truck. It sounds like the timing could be off. One thing that could cause this is when a timing chain/timing belt jumps a tooth on the gear. Also a more in-depth promblem could be in the the intake or exhaust valves in the heads. … Read more

As long as the car is not running to hot, the senser that tells the electric fan to come on and off is probaly not working correctly and would need to be replaced. CJ77

Sounds to me you have a Chevy product. Once the wheels are removed, dissasemble the brake shoes from the backing plate and emergency cable. Make sure the car has jack stands under it. Remove the rear axle cover. There should be 2 clis that will need to be removed. One on each axle inside of … Read more