Same problems after new plugs and wires. Help!!
08-13-2008, 10:51 AM
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Staging Lane
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Same problems after new plugs and wires. Help!! Just installed the new MSD 8.5 wires and TR55 plugs and I still have a bad misfire problem. I took it out and drove it around watching the misfire data and found that 1 had 20, 2 had 17, 3 had 92, 4 had 4, 5 had 177, 6 had 344, 7 had 3, and 8 had 4 misfires. The two codes that are still coming up are P0300 engine misfire detected and P0353 #3 coil circuit control. O2's are reading good. Anyone have any idea what this might be tied together by? I have also tried swaping back to stock maf. Bought car in 03 with 43k problem started at 45k. Changed plugs 55k and found 7 delco's 1 NGK(number 5 cyl I think) changed coil number 3 also. Changed wires at 65k. And now latest plugs and wires at 83k. Old plugs look normal. # 7 wire, plug side connector was rusted.
