Codes 304 & 401 Check eng. soon
Engine had been running a little rough after this 1999 F-150 4.6 had been sitting for a while. Local shop checked Obd and came up with Codes 304 & 401. This said I pulled plug #1 first to check what may be going on. The plug looked pretty good and the gap was almost spot on. Then I went for the gold and removed #4 which unlike #1 the boot was loaded with grease and the plug itself was vairly well fouled. This plug was thouroughly cleaned and regapped and torqued back into place. Started the engine which now appeared to be running quite well. I disconnected the battery for a while to get rid of the engine light and now curious to see if the engine light comes back on.
Need to find out what most likely caused # 4 to foul and missfire.
Thank You in advance for your help.