2003 sonoma 4.3 ltr runs rough

I have a 2003 sonoma, I changed the plugs, wires, rotor, and distributer cap and now it runs rough and is throwing a PO300 code. The cap only goes on one way. Any ideas??:screwy:

P0300 is almost ALWAYS caused by a fault in secondary ignition parts, (plugs, wires, cap & rotor).

Are you sure the cap is wired correctly?


http://i561.photobucket.com/albums/ss58/cwhook/97newer43Lfiringorder-Copy.jpg

The 4.3 can be very fussy when it comes to ignition parts. AC Delco plugs #41-993 and AC Delco cap, rotor and wires will assure proper performance.

Low fuel pressure and or excessive leakdown can cause P0300 also. Have you checked fuel pressure and leakdown?

Did u check gap in plugs? You have the firing order correct?