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Originally Posted by Andre L.
i have purchaced on line the obd2 vechicle explorer, which runs on my laptop, but am unable to retreive the misfire cylinder since the onboard comp. is not latching any codes, the only code that i did get lately is the emmisions code po420 which points to the last oxygen sensor down stream. That is all for codes, and like always it starts like a dream and idles, just on slow acceleration or highway cruise it bucks. The engine is stock 4.3 - i thought that it had throlte body injection sys ?? correct me if i am wrong please - its hard to see in there (small place). Oh ya - the plugs are bosh platinum single electrode with 1 gnd post - , i had the multi platinum bosh with 4 gnd prongs before and found no gains from them. Also had ngk low res wires before and same - no gain so i went back to a new set of stock wires.
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Code 420 could be caused by a lot of things besides the 02 ssensor.
You need to work on the missfire first as it could be the cause of code 420.
Also the bosh plugs are not the best plugs for it.
I would try a set of ac-delco plugs the book calls for and go from there.
Is the check engine light flashing or just on steady.
A flashing engine light is a missfire.
If the ac delco plugs do not cure it you may have to find someone with a engine capable scanner to find the miss firing cylinder or other problems.
Also check fuel pressure and fuel filter.
Good luck
MT