400E idles rough in gear
Just today my 92 400E started to idle a little rough when its in gear. Could it be a spark plug wire or a bad boot that is causing this? How do I go about diagnosing it? Im dreading that it will be a bad wire harness? anyone had this happen to them? Its not bad, but noticable, and it doesnt do it consistently. The car starts fine, whether cold or hot, and accelerates very strongly. I think I may need a new thermostat because it runs consistently a hair under 80 degrees.
Another thing that is a little off the subject, the bass speaker in the pass side door makes a cracking and popping noises when I turn the radio up loud. Where Can I find a replacement speaker?
Thanks for all advice.
93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K