Signs of vacuum leak?
I noticed on my car the other day that the seam between the throttlebody and the EGR spacers has what looks like a fine layer of carbon like it's seeping out from the inside. Wierd.
I don't recall it ever having that before and I have never had the throttle body off the car. Last week it idled at like 650 or 700rpm (sounded mean BTW) and then the next morning it ran like garbage at start up and then once warm it surged slightly.
I have a slight, ocassional surge and I've checked/cleaned everything. Gotta look at the grounding and check for vacum leaks though. Neither of thoe occured to me before.
My car has a B303 cam. If I turn on the A/C it surges worse and more often. AT cold start up it idles ok for maybe 30 seconds then it stumbles and coughes and then the idle jumps to like 800rpm and then it starts to settle and idles past 650-700 and stumbles and coughes again. It repeats this cycle till it either stalls or gets warm enough to run correctly with the occassional slight surge.
Any one have any suggestions?