This truck is exhibiting symptoms of a bad catalytic converter. It is sluggish and loses power on hills and based on its age, it is a safe bet that replacing the cat may fix these problems, replacing the cat with a new Magnaflow converter is a very cheap repair on this old truck. After i replaced the cat, i noticed significant improvement in power. Magnaflow Universal Catalytic Converters: http://amzn.to/24Ll0co

Details: http://zipzapdiy.com/install-magnaflo...

Tools needed are a Sawzall or angle grinder with a metal blade and some wrenches for the clamps.

some install notes.
1. The Magnaflow catalytic converter can be installed with airflow going in either direction.
2. The heat shield on the Magnaflow universal cat faces up.
3. The exhaust pipe size on this 1991 c1500 truck is 2.5 inch outside diameter.
4. welding the pipes together is the ideal install, but the pipe clamps are adequate.

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