Have a code for p0300, only misfires while going up hill, changed the cap, rotor, plug wires and plugs and still does it. I know there is a recall for the EFI on these that covers 200,000 miles or 10 years which is just out of it. So my question is for mechanics that have had similar problems with these chevys and what they found. From searching around i saw distributor play can cause this, the efi and a couple other things. Also the coil is within the ohm range as well. Just looking for suggestions.
