When I bought my '01 DII a month ago the SES was on for bad front O2's. Swapped them and cleared the codes. All was well for about 50 miles and then I got 3 codes for misfires. P0300, 301 and 305. Just wondering if the issues are related? Plug and wires were done about a year ago, but I'm thinking maybe the trims could have been off and messed the plug up? I Haven't had a chnace to pull one yet to see. I reset the codes again and misfires have not shown up in 25 miles but I'm assuming they might take some time.

 

5 is easy to pull without needing wobble sockets. The only way to know is to see.

If you have one, a cheap smart phone boroscope would allow you to see inside the cylinder for an even better look.

 

First I learn from this forum about the OBD2 wifi dongle and Torque app.
Now, a cheap usb borescope? You guys are awsome!