Ticking Motor Noise
While on a road trip last weekend, going down the interstate @ 75 mph and hear a ticking coming from the engine compartment, loud enough to be heard over the radio. It seems to be correspondant to the RPM, as when I let off the gass it slows down. I parked and listened, revved up, and heard it speeding up with the engine noise. Popped the hood and can hear it coming from the top of the engine, on the driver side, but behind the alternator/belts/etc, like possibly from the valve cover or spark plugs. We got to where we were going, the car sat and cooled for 4 hours, left, and was fine for the first 10-15 min, then when car was up to speed/heated up, it started again. I also have the infamous "oil pressure gauge drops when @ stop light but doesnt stall or anything", and not sure if this could be part of that? Checked the oil, levels are fine. 130k miles by the way.