I am looking for the service manual for a 2002 Chevy Sliverado. Single Cab. If anyone can help me please. It driving rough and I have replace the spider injection with a brand new one, which was not cheap. It will run great for a day then back. New plugs. Since it was taken on a joyride by some local kids it has ran bad. Thinking might had a wire or something crossed. Idk please help. 4.3 v6

 

Here is the only free one I know of:

Repair and Diagnosis — 2002 Chevrolet C 1500 Truck 2WD V6-4.3L VIN W Service Manual | Operation CHARM

 

Can you scan for any codes?

 

Yep - what @Rednucleus said - if its running rough on a 2002, the check engine light should be lit, probably solid, and the computer should tell you something is wrong. Unless its something crazy that the kids did to it of course.