Ok I have a 2000 Buick Regal GS and she developed a bad misfire on cylinder 3. Im in school so the first thing I did was check the plugs. The plugs were ok I adjusted the gaps and reinstalled them. I still have the skip on cylinder 3 history shows its been misfiring 52k times and counting. So I checked the coils and icm. They all checked out to be good. So I check the injectors and there find I put a noid light on the electrical connector and they all check out. So now its getting frustrating I have 2k miles on this engine stock engine had piece of the piston missing on cylinder 4 mainly and a few others but not as bad as cylinder 4. So I recently did a compression test on her and the lowest reading was 172 p.s.i. to the highest 185 p.s.i. and all between these numbers seemed to be excellent. We got the engine from a 98 Buick Riveara supercharged. New head gaskets, head bolts intake the whole nine yards. And after all that its still misfiring. Oh I just put a set of wires on her to no avail. If you all have an other suggestion please and I mean please feel free to respond im all ears you all helped me with my transmission so I have the upmost respect and confidence in you all thanx in advance.
