Don't engines burn valves anymore? Everyone is looking at electrical/vacuum/fuel systems for rough idle conditions. Eventually you're going to run out of parts to replace. It might be time to do a compression test.
Karl


*** It's all about consistency! *** *** Previously 88SVT *** 06 F150 Supercrew 5.4L FX4 98 SVT Contour #4362 Born 1/6/1998 86 Ranger GT (For Sale) 69 Fiat 850 Sport Spider (For Sale) 67 Formula-S Barracuda