I have a 2000 Ford Taurus 3.0 OHV that is making a strange engine noise when I accelerate. The sound only happens when I aggressively accelerate, at normal acceleration it doesn't seem to make noise. The only times I notice it is when I get on to an highway or when I pass someone on the highway. I first thought it might be a spark knock, however the noise seems consistent not matter which type/brand of fuel I use. Someone else thought it might be bad values. Its likes a knock, tick, rattle type of sound (hard to explain). Spark plugs are fairly new (10k on them), I put them in as soon as I purchased the car (used) and its made the noise since I bought it.
Any ideas of what this noise could be? I don't want to have to take it into a dealer.
Thanks vtx