Sean-Alex Smith· Registered
Discussion Starter · #1 ·
Hey I have a 2002 GMC Sierra 1500 with the 5.3. This truck has not ran right for a while, and am trying to fix it up. It has sort of hit or miss power loss. Half the time, it runs ok, as in you can floor it and it will go, the other half of the time it is hardly pulling its own weight! It acts like it is starving for air/fuel. This truck has a new fuel pump, and fresh tune-up done this week. The o2 sensors were pulled off to test if the cats were clogged, and it just ran worse with them off.(yes, the air cleaner is clean) It still runs like crap! Any suggestions??? This truck has 170,000 miles on it.